<?xml version="1.0" encoding="us-ascii"?><InstanceReport xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"><Version>2.4.0.8</Version><ReportLongName>122 - Disclosure - Related Party Transactions (Tables)</ReportLongName><DisplayLabelColumn>true</DisplayLabelColumn><ShowElementNames>false</ShowElementNames><RoundingOption /><HasEmbeddedReports>false</HasEmbeddedReports><Columns><Column FlagID="0"><Id>1</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelSeparator>

</LabelSeparator><CurrencyCode /><FootnoteIndexer /><hasSegments>false</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName /><CurrencySymbol /><contextRef><ContextID>eol_PE10315---1310-Q0011_STD_181_20130630_0</ContextID><EntitySchema>http://www.sec.gov/CIK</EntitySchema><EntityValue>0001069308</EntityValue><PeriodDisplayName /><PeriodType>duration</PeriodType><PeriodStartDate>2013-01-01T00:00:00</PeriodStartDate><PeriodEndDate>2013-06-30T00:00:00</PeriodEndDate><Segments /><Scenarios /></contextRef><UPS /><CurrencyCode /><OriginalCurrencyCode /></MCU><CurrencySymbol /><Labels><Label Key="CalendarSupplement" Id="0" Label="6 Months Ended" /><Label Key="Calendar" Id="1" Label="Jun. 30, 2013" /></Labels></Column></Columns><Rows><Row FlagID="0"><Id>1</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelSeparator>

</LabelSeparator><Level>4</Level><ElementName>us-gaap_ScheduleOfDebtConversionsTextBlock</ElementName><ElementPrefix>us-gaap_</ElementPrefix><IsBaseElement>true</IsBaseElement><BalanceType>na</BalanceType><PeriodType>duration</PeriodType><IsReportTitle>false</IsReportTitle><IsSegmentTitle>false</IsSegmentTitle><IsCalendarTitle>false</IsCalendarTitle><IsEquityPrevioslyReportedAsRow>false</IsEquityPrevioslyReportedAsRow><IsEquityAdjustmentRow>false</IsEquityAdjustmentRow><IsBeginningBalance>false</IsBeginningBalance><IsEndingBalance>false</IsEndingBalance><IsReverseSign>false</IsReverseSign><PreferredLabelRole>terseLabel</PreferredLabelRole><FootnoteIndexer /><Cells><Cell FlagID="0" ContextID="eol_PE10315---1310-Q0011_STD_181_20130630_0" UnitID=""><Id>1</Id><IsNumeric>false</IsNumeric><IsRatio>false</IsRatio><DisplayZeroAsNone>false</DisplayZeroAsNone><NumericAmount>0</NumericAmount><RoundedNumericAmount>0</RoundedNumericAmount><NonNumbericText>&lt;div style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt"&gt;
&lt;div style="TEXT-INDENT: 18pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="justify"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt"&gt;The
following table provides a summary of the changes in convertible
debt &amp;#x2013; third parties, net of unamortized discount, during the
quarter ended June 30, 2013:&lt;/font&gt;&lt;/div&gt;
&lt;div style="TEXT-INDENT: 0pt; DISPLAY: block"&gt;&lt;br /&gt;&lt;/div&gt;
&lt;div align="center"&gt;
&lt;table style="FONT-FAMILY: times new roman; FONT-SIZE: 10pt" cellspacing="0" cellpadding="0" width="90%"&gt;
&lt;tr bgcolor="#CCEEFF"&gt;
&lt;td valign="bottom" width="88%" align="left"&gt;
&lt;div style="TEXT-INDENT: -18pt; DISPLAY: block; MARGIN-LEFT: 18pt; MARGIN-RIGHT: 0pt" align="left"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;Balance
at December 31, 2012&lt;/font&gt;&lt;/div&gt;
&lt;/td&gt;
&lt;td valign="bottom" width="1%" align="left"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td style="TEXT-ALIGN: left" valign="bottom" width="1%"&gt;
&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;
$&lt;/font&gt;&lt;/td&gt;
&lt;td style="TEXT-ALIGN: right" valign="bottom" width="9%"&gt;
&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;318,658&lt;/font&gt;&lt;/td&gt;
&lt;td style="TEXT-ALIGN: left" valign="bottom" width="1%" nowrap="nowrap"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr bgcolor="white"&gt;
&lt;td valign="bottom" width="88%" align="left"&gt;
&lt;div style="TEXT-INDENT: -18pt; DISPLAY: block; MARGIN-LEFT: 18pt; MARGIN-RIGHT: 0pt" align="left"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;January
2013 Notes, face value&lt;/font&gt;&lt;/div&gt;
&lt;/td&gt;
&lt;td valign="bottom" width="1%" align="left"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td style="TEXT-ALIGN: left" valign="bottom" width="1%"&gt;
&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;
&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td style="TEXT-ALIGN: right" valign="bottom" width="9%"&gt;
&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;550,000&lt;/font&gt;&lt;/td&gt;
&lt;td style="TEXT-ALIGN: left" valign="bottom" width="1%" nowrap="nowrap"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr bgcolor="#CCEEFF"&gt;
&lt;td valign="bottom" width="88%" align="left"&gt;
&lt;div style="TEXT-INDENT: -18pt; DISPLAY: block; MARGIN-LEFT: 18pt; MARGIN-RIGHT: 0pt" align="left"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;Discount
on beneficial conversion feature of January 2013 Notes at
issuance&lt;/font&gt;&lt;/div&gt;
&lt;/td&gt;
&lt;td valign="bottom" width="1%" align="left"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td style="TEXT-ALIGN: left" valign="bottom" width="1%"&gt;
&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;
&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td style="TEXT-ALIGN: right" valign="bottom" width="9%"&gt;
&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;(120,009&lt;/font&gt;&lt;/td&gt;
&lt;td style="TEXT-ALIGN: left" valign="bottom" width="1%" nowrap="nowrap"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;)&lt;/font&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr bgcolor="white"&gt;
&lt;td valign="bottom" width="88%" align="left"&gt;
&lt;div style="TEXT-INDENT: -18pt; DISPLAY: block; MARGIN-LEFT: 18pt; MARGIN-RIGHT: 0pt" align="left"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;Discount
on fair value of Series J warrant liability at
issuance&lt;/font&gt;&lt;/div&gt;
&lt;/td&gt;
&lt;td valign="bottom" width="1%" align="left"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td style="TEXT-ALIGN: left" valign="bottom" width="1%"&gt;
&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;
&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td style="TEXT-ALIGN: right" valign="bottom" width="9%"&gt;
&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;(165,820&lt;/font&gt;&lt;/td&gt;
&lt;td style="TEXT-ALIGN: left" valign="bottom" width="1%" nowrap="nowrap"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;)&lt;/font&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr bgcolor="#CCEEFF"&gt;
&lt;td valign="bottom" width="88%" align="left"&gt;
&lt;div style="TEXT-INDENT: -18pt; DISPLAY: block; MARGIN-LEFT: 18pt; MARGIN-RIGHT: 0pt" align="left"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;Repayment
of January 23, 2013 Notes&lt;/font&gt;&lt;/div&gt;
&lt;/td&gt;
&lt;td valign="bottom" width="1%" align="left"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td style="TEXT-ALIGN: left" valign="bottom" width="1%"&gt;
&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;
&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td style="TEXT-ALIGN: right" valign="bottom" width="9%"&gt;
&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;(450,000&lt;/font&gt;&lt;/td&gt;
&lt;td style="TEXT-ALIGN: left" valign="bottom" width="1%" nowrap="nowrap"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;)&lt;/font&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr bgcolor="white"&gt;
&lt;td valign="bottom" width="88%" align="left"&gt;
&lt;div style="TEXT-INDENT: -18pt; DISPLAY: block; MARGIN-LEFT: 18pt; MARGIN-RIGHT: 0pt" align="left"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;Conversion
of January 23, 2013 Notes into common
stock&amp;#x2026;&amp;#x2026;&amp;#x2026;&amp;#x2026;&amp;#x2026;&amp;#x2026;&amp;#x2026;&amp;#x2026;&amp;#x2026;&amp;#x2026;&amp;#x2026;&lt;/font&gt;&lt;/div&gt;
&lt;/td&gt;
&lt;td valign="bottom" width="1%" align="left"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td style="TEXT-ALIGN: left" valign="bottom" width="1%"&gt;
&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;
&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td style="TEXT-ALIGN: right" valign="bottom" width="9%"&gt;
&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;(100,000&lt;/font&gt;&lt;/td&gt;
&lt;td style="TEXT-ALIGN: left" valign="bottom" width="1%" nowrap="nowrap"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;)&lt;/font&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr bgcolor="#CCEEFF"&gt;
&lt;td valign="bottom" width="88%" align="left"&gt;
&lt;div style="TEXT-INDENT: -18pt; DISPLAY: block; MARGIN-LEFT: 18pt; MARGIN-RIGHT: 0pt" align="left"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;Conversion
of July 25, 2012 Notes into common
stock&amp;#x2026;&amp;#x2026;..&amp;#x2026;&amp;#x2026;&amp;#x2026;&amp;#x2026;&amp;#x2026;&amp;#x2026;&amp;#x2026;&amp;#x2026;&amp;#x2026;&amp;#x2026;&lt;/font&gt;&lt;/div&gt;
&lt;/td&gt;
&lt;td valign="bottom" width="1%" align="left"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td style="TEXT-ALIGN: left" valign="bottom" width="1%"&gt;
&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;
&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td style="TEXT-ALIGN: right" valign="bottom" width="9%"&gt;
&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;(900,000&lt;/font&gt;&lt;/td&gt;
&lt;td style="TEXT-ALIGN: left" valign="bottom" width="1%" nowrap="nowrap"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;)&lt;/font&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr bgcolor="white"&gt;
&lt;td style="PADDING-BOTTOM: 2px" valign="bottom" width="88%" align="left"&gt;
&lt;div style="TEXT-INDENT: -18pt; DISPLAY: block; MARGIN-LEFT: 18pt; MARGIN-RIGHT: 0pt" align="left"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;Amortization
of debt discount to interest expense through June 30,
2013&lt;/font&gt;&lt;/div&gt;
&lt;/td&gt;
&lt;td style="PADDING-BOTTOM: 2px" valign="bottom" width="1%" align="left"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: left" valign="bottom" width="1%"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: right" valign="bottom" width="9%"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;1,285,872&lt;/font&gt;&lt;/td&gt;
&lt;td style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: left" valign="bottom" width="1%" nowrap="nowrap"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr bgcolor="#CCEEFF"&gt;
&lt;td style="PADDING-BOTTOM: 4px" valign="bottom" width="88%" align="left"&gt;
&lt;div style="TEXT-INDENT: -18pt; DISPLAY: block; MARGIN-LEFT: 18pt; MARGIN-RIGHT: 0pt" align="left"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;Balance
at June 30, 2013&lt;/font&gt;&lt;/div&gt;
&lt;/td&gt;
&lt;td style="PADDING-BOTTOM: 4px" valign="bottom" width="1%" align="left"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td style="BORDER-BOTTOM: black 4px double; TEXT-ALIGN: left" valign="bottom" width="1%"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;
&lt;td style="BORDER-BOTTOM: black 4px double; TEXT-ALIGN: right" valign="bottom" width="9%"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;&lt;font style="DISPLAY: inline"&gt;
418,701&lt;/font&gt;&lt;/font&gt;&lt;/td&gt;
&lt;td style="BORDER-BOTTOM: black 4px double; TEXT-ALIGN: left" valign="bottom" width="1%" nowrap="nowrap"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr bgcolor="white"&gt;
&lt;td valign="bottom" width="88%"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td valign="bottom" width="1%"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td style="TEXT-ALIGN: left" valign="bottom" width="1%"&gt;
&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;
&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td style="TEXT-ALIGN: right" valign="bottom" width="9%"&gt;
&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td style="TEXT-ALIGN: left" valign="bottom" width="1%" nowrap="nowrap"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;/div&gt;</NonNumbericText><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat></Cell></Cells><ElementDataType>nonnum:textBlockItemType</ElementDataType><SimpleDataType>na</SimpleDataType><ElementDefenition>Tabular disclosure of information on an original debt issue that has been converted in a noncash (or part noncash) transaction during the accounting period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. The information may be presented entirely or partially in this block of text or in the associated elements.</ElementDefenition><ElementReferences>Reference 1: http://www.xbrl.org/2003/role/presentationRef

 -Publisher FASB

 -Name Accounting Standards Codification

 -Topic 230

 -SubTopic 10

 -Section 50

 -Paragraph 5

 -URI http://asc.fasb.org/extlink&amp;oid=6367179&amp;loc=d3e4332-108586



Reference 2: http://www.xbrl.org/2003/role/presentationRef

 -Publisher FASB

 -Name Accounting Standards Codification

 -Topic 230

 -SubTopic 10

 -Section 50

 -Paragraph 4

 -URI http://asc.fasb.org/extlink&amp;oid=6367179&amp;loc=d3e4313-108586



Reference 3: http://www.xbrl.org/2003/role/presentationRef

 -Publisher FASB

 -Name Accounting Standards Codification

 -Topic 230

 -SubTopic 10

 -Section 50

 -Paragraph 3

 -URI http://asc.fasb.org/extlink&amp;oid=6367179&amp;loc=d3e4304-108586



</ElementReferences><IsTotalLabel>false</IsTotalLabel><UnitID>0</UnitID><Label>Summary of Changes in Convertible Debt - Third Parties, Net of Unamortized Discount</Label></Row><Row FlagID="0"><Id>2</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelSeparator>

</LabelSeparator><Level>0</Level><ElementName /><ElementPrefix /><IsBaseElement>true</IsBaseElement><BalanceType /><PeriodType /><IsReportTitle>false</IsReportTitle><IsSegmentTitle>true</IsSegmentTitle><IsCalendarTitle>false</IsCalendarTitle><IsEquityPrevioslyReportedAsRow>false</IsEquityPrevioslyReportedAsRow><IsEquityAdjustmentRow>false</IsEquityAdjustmentRow><IsBeginningBalance>false</IsBeginningBalance><IsEndingBalance>false</IsEndingBalance><IsReverseSign>false</IsReverseSign><PreferredLabelRole /><FootnoteIndexer /><Cells><Cell FlagID="0" ContextID="" UnitID=""><Id>1</Id><IsNumeric>false</IsNumeric><IsRatio>false</IsRatio><DisplayZeroAsNone>false</DisplayZeroAsNone><NumericAmount>0</NumericAmount><RoundedNumericAmount>0</RoundedNumericAmount><NonNumbericText /><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat></Cell></Cells><OriginalInstanceReportColumn FlagID="0"><Id>2</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelSeparator>

</LabelSeparator><CurrencyCode /><FootnoteIndexer /><hasSegments>true</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName /><CurrencySymbol /><contextRef><ContextID>eol_PE10315---1310-Q0011_STD_181_20130630_0_711672x800231</ContextID><EntitySchema>http://www.sec.gov/CIK</EntitySchema><EntityValue>0001069308</EntityValue><PeriodDisplayName /><PeriodType>duration</PeriodType><PeriodStartDate>2013-01-01T00:00:00</PeriodStartDate><PeriodEndDate>2013-06-30T00:00:00</PeriodEndDate><Segments><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Related Party Transactions</ValueName><ValueType>us-gaap_RelatedPartyTransactionsByRelatedPartyAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>opxa_RelatedPartyTransactionsMember</Id><dimensionId>us-gaap_RelatedPartyTransactionsByRelatedPartyAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType></Segments><Scenarios /></contextRef><UPS /><CurrencyCode /><OriginalCurrencyCode /></MCU><CurrencySymbol /><Labels><Label Key="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis:opxa_RelatedPartyTransactionsMember" Id="0" Label="Related Party Transactions" /><Label Key="Calendar" Id="1" Label="1/1/2013 - 6/30/2013" /></Labels></OriginalInstanceReportColumn><ElementDataType>na</ElementDataType><SimpleDataType>na</SimpleDataType><IsTotalLabel>false</IsTotalLabel><UnitID>0</UnitID><Label>Related Party Transactions</Label></Row><Row FlagID="0"><Id>3</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelSeparator>

</LabelSeparator><Level>4</Level><ElementName>us-gaap_ScheduleOfDebtConversionsTextBlock</ElementName><ElementPrefix>us-gaap_</ElementPrefix><IsBaseElement>true</IsBaseElement><BalanceType>na</BalanceType><PeriodType>duration</PeriodType><IsReportTitle>false</IsReportTitle><IsSegmentTitle>false</IsSegmentTitle><IsCalendarTitle>false</IsCalendarTitle><IsEquityPrevioslyReportedAsRow>false</IsEquityPrevioslyReportedAsRow><IsEquityAdjustmentRow>false</IsEquityAdjustmentRow><IsBeginningBalance>false</IsBeginningBalance><IsEndingBalance>false</IsEndingBalance><IsReverseSign>false</IsReverseSign><PreferredLabelRole>terseLabel</PreferredLabelRole><FootnoteIndexer /><Cells><Cell FlagID="0" ContextID="eol_PE10315---1310-Q0011_STD_181_20130630_0_711672x800231" UnitID=""><Id>1</Id><IsNumeric>false</IsNumeric><IsRatio>false</IsRatio><DisplayZeroAsNone>false</DisplayZeroAsNone><NumericAmount>0</NumericAmount><RoundedNumericAmount>0</RoundedNumericAmount><NonNumbericText>&lt;div style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt"&gt;
&lt;div style="TEXT-INDENT: 18pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="justify"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt"&gt;The
following table provides a summary of the changes in convertible
debt &amp;#x2013; related parties, net of unamortized discount, during
the quarter ended June 30, 2013:&lt;/font&gt;&lt;/div&gt;
&lt;div style="TEXT-INDENT: 0pt; DISPLAY: block"&gt;&lt;br /&gt;&lt;/div&gt;
&lt;div align="center"&gt;
&lt;table style="FONT-FAMILY: times new roman; FONT-SIZE: 10pt" cellspacing="0" cellpadding="0" width="90%"&gt;
&lt;tr bgcolor="#CCEEFF"&gt;
&lt;td valign="bottom" width="88%" align="left"&gt;
&lt;div style="TEXT-INDENT: -18pt; DISPLAY: block; MARGIN-LEFT: 18pt; MARGIN-RIGHT: 0pt" align="left"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;Balance
at December 31, 2012&lt;/font&gt;&lt;/div&gt;
&lt;/td&gt;
&lt;td valign="bottom" width="1%" align="left"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td style="TEXT-ALIGN: left" valign="bottom" width="1%"&gt;
&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;
$&lt;/font&gt;&lt;/td&gt;
&lt;td style="TEXT-ALIGN: right" valign="bottom" width="9%"&gt;
&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;58,105&lt;/font&gt;&lt;/td&gt;
&lt;td style="TEXT-ALIGN: left" valign="bottom" width="1%" nowrap="nowrap"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
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&lt;td valign="bottom" width="88%" align="left"&gt;
&lt;div style="TEXT-INDENT: -18pt; DISPLAY: block; MARGIN-LEFT: 18pt; MARGIN-RIGHT: 0pt" align="left"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;January
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&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
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&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;100,000&lt;/font&gt;&lt;/td&gt;
&lt;td style="TEXT-ALIGN: left" valign="bottom" width="1%" nowrap="nowrap"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
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&lt;td valign="bottom" width="88%" align="left"&gt;
&lt;div style="TEXT-INDENT: -18pt; DISPLAY: block; MARGIN-LEFT: 18pt; MARGIN-RIGHT: 0pt" align="left"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;Discount
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&lt;td style="TEXT-ALIGN: left" valign="bottom" width="1%"&gt;
&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;
&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
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&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;(21,820&lt;/font&gt;&lt;/td&gt;
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&lt;div style="TEXT-INDENT: -18pt; DISPLAY: block; MARGIN-LEFT: 18pt; MARGIN-RIGHT: 0pt" align="left"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;Discount
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&lt;td style="TEXT-ALIGN: left" valign="bottom" width="1%"&gt;
&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;
&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td style="TEXT-ALIGN: right" valign="bottom" width="9%"&gt;
&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;(30,149&lt;/font&gt;&lt;/td&gt;
&lt;td style="TEXT-ALIGN: left" valign="bottom" width="1%" nowrap="nowrap"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;)&lt;/font&gt;&lt;/td&gt;
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&lt;td valign="bottom" width="88%" align="left"&gt;
&lt;div style="TEXT-INDENT: -18pt; DISPLAY: block; MARGIN-LEFT: 18pt; MARGIN-RIGHT: 0pt" align="left"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;Repayment
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&lt;td style="TEXT-ALIGN: left" valign="bottom" width="1%"&gt;
&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;
&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td style="TEXT-ALIGN: right" valign="bottom" width="9%"&gt;
&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;(100,000&lt;/font&gt;&lt;/td&gt;
&lt;td style="TEXT-ALIGN: left" valign="bottom" width="1%" nowrap="nowrap"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;)&lt;/font&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr bgcolor="white"&gt;
&lt;td style="PADDING-BOTTOM: 2px" valign="bottom" width="88%" align="left"&gt;
&lt;div style="TEXT-INDENT: -18pt; DISPLAY: block; MARGIN-LEFT: 18pt; MARGIN-RIGHT: 0pt" align="left"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;Amortization
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&lt;td style="PADDING-BOTTOM: 2px" valign="bottom" width="1%" align="left"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: left" valign="bottom" width="1%"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: right" valign="bottom" width="9%"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;97,105&lt;/font&gt;&lt;/td&gt;
&lt;td style="BORDER-BOTTOM: black 2px solid; TEXT-ALIGN: left" valign="bottom" width="1%" nowrap="nowrap"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr bgcolor="#CCEEFF"&gt;
&lt;td style="PADDING-BOTTOM: 4px" valign="bottom" width="88%" align="left"&gt;
&lt;div style="TEXT-INDENT: -18pt; DISPLAY: block; MARGIN-LEFT: 18pt; MARGIN-RIGHT: 0pt" align="left"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;Balance
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&lt;td style="BORDER-BOTTOM: black 4px double; TEXT-ALIGN: left" valign="bottom" width="1%"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;$&lt;/font&gt;&lt;/td&gt;
&lt;td style="BORDER-BOTTOM: black 4px double; TEXT-ALIGN: right" valign="bottom" width="9%"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;103,241&lt;/font&gt;&lt;/td&gt;
&lt;td style="BORDER-BOTTOM: black 4px double; TEXT-ALIGN: left" valign="bottom" width="1%" nowrap="nowrap"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr bgcolor="white"&gt;
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&lt;td valign="bottom" width="1%"&gt;&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
&lt;td style="TEXT-ALIGN: left" valign="bottom" width="1%"&gt;
&lt;font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt"&gt;
&amp;#xA0;&lt;/font&gt;&lt;/td&gt;
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