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  <element name="PortionOfCreditFacilityMember" id="life_PortionOfCreditFacilityMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PrincipalValueOfRemainingNotesSettled" id="life_PrincipalValueOfRemainingNotesSettled" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PurchasedTechnologyMember" id="life_PurchasedTechnologyMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PurchasedTradenamesAndTrademarksMember" id="life_PurchasedTradenamesAndTrademarksMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PurchaseRateOfSeniorNotesPrincipalInCaseOfChangeInControl" id="life_PurchaseRateOfSeniorNotesPrincipalInCaseOfChangeInControl" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RangeOfLetterOfCreditFees" id="life_RangeOfLetterOfCreditFees" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ReconciliationOfEquityLineItems" id="life_ReconciliationOfEquityLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ReductionToBalanceOfUnrecognizedTaxBenefits" id="life_ReductionToBalanceOfUnrecognizedTaxBenefits" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RepurchaseOfCommonStock" id="life_RepurchaseOfCommonStock" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RepurchaseProgramDecemberTwoThousandTenMember" id="life_RepurchaseProgramDecemberTwoThousandTenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RepurchaseProgramJulyTwoThousandTenMember" id="life_RepurchaseProgramJulyTwoThousandTenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RepurchaseProgramTwoThousandElevenMember" id="life_RepurchaseProgramTwoThousandElevenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RepurchaseProgramTwoThousandTenMember" id="life_RepurchaseProgramTwoThousandTenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RepurchaseProgramTwoThousandTwelveMember" id="life_RepurchaseProgramTwoThousandTwelveMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RevenueMember" id="life_RevenueMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SalesGeneralAndAdministrativeMember" id="life_SalesGeneralAndAdministrativeMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfInventoryLineItems" id="life_ScheduleOfInventoryLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfInventoryTable" id="life_ScheduleOfInventoryTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="ScheduleOfReconciliationOfEquityTable" id="life_ScheduleOfReconciliationOfEquityTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="SchedulePrepaidExpensesAndOtherAssetsLineItems" id="life_SchedulePrepaidExpensesAndOtherAssetsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SchedulePrepaidExpensesAndOtherAssetsTable" id="life_SchedulePrepaidExpensesAndOtherAssetsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="SelfInsuredWorkersCompensationProgramsMember" id="life_SelfInsuredWorkersCompensationProgramsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SeniorNotesFourMember" id="life_SeniorNotesFourMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SeniorNotesOneMember" id="life_SeniorNotesOneMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SeniorNotesThreeMember" id="life_SeniorNotesThreeMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SeniorNotesTwoMember" id="life_SeniorNotesTwoMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SeniorUnsecuredNotesOfferedInDecemberTwentyTenMember" id="life_SeniorUnsecuredNotesOfferedInDecemberTwentyTenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SeniorUnsecuredNotesOfferedInFebruaryTwentyTenMember" id="life_SeniorUnsecuredNotesOfferedInFebruaryTwentyTenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SeniorUnsecuredNotesOfferedInTwentyTenMember" id="life_SeniorUnsecuredNotesOfferedInTwentyTenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SettlementsInMilestonePayment" id="life_SettlementsInMilestonePayment" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardExpirationPeriod" id="life_ShareBasedCompensationArrangementByShareBasedPaymentAwardExpirationPeriod" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="StockOptionsAndPurchaseRightsMember" id="life_StockOptionsAndPurchaseRightsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SummaryOfFairValueAndValuationApproachOfFinancialInstrumentsTableTextBlock" id="life_SummaryOfFairValueAndValuationApproachOfFinancialInstrumentsTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="VariableRateBasisAxis" id="life_VariableRateBasisAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:dimensionItem"/>
  <element name="VariableRateBasisDomain" id="life_VariableRateBasisDomain" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="VestingTermOfRestrictedStockUnitsGeneralMaximum" id="life_VestingTermOfRestrictedStockUnitsGeneralMaximum" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WeightedAveragePeriodForUnamortizedIssuanceCost" id="life_WeightedAveragePeriodForUnamortizedIssuanceCost" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
</schema>
