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Inventory	12 Months Ended
Dec. 31, 2012
Inventory	18. Inventory The inventory balance at December 31, 2012 of $24.9 million consisted of Tysabri finished goods and has been presented as part of the assets held for sale. For information on the assets of the Tysabri business that have been presented as held for sale as of December 31, 2012, refer to Note 15. Product inventories at December 31, 2011 of $23.8 million also consisted of Tysabri finished goods inventory.

Inventory

12 Months Ended

Dec. 31, 2012

18. Inventory

The inventory balance at December 31, 2012 of $24.9 million consisted of Tysabri finished goods and has been presented as part of the assets held for sale. For information on the assets of the Tysabri business that have been presented as held for sale as of December 31, 2012, refer to Note 15.

Product inventories at December 31, 2011 of $23.8 million also consisted of Tysabri finished goods inventory.

- Definition

The entire disclosure for inventory. This may include, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the major classes of inventory, and the nature of the cost elements included in inventory. If inventory is stated above cost, accrued net losses on firm purchase commitments for inventory and losses resulting from valuing inventory at the lower-of-cost-or-market may also be included. For LIFO inventory, may disclose the amount and basis for determining the excess of replacement or current cost over stated LIFO value and the effects of a LIFO quantities liquidation that impacts net income.

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