We have witnessed numerous examples over the years of biotech/pharma companies selling-off over fears of the length of patent protection on an essential product. The concern is well-founded--if the company relies on the product for a significant portion of sales, it may be challenging to replace, especially if the clinical pipeline is relatively bereft of viable next-generation products. We believe the recent sell-off in the shares of Allergan may now be wholly factoring in the loss of patent protection of one of its core assets in Restasis, and the equity may not be getting enough credit for its highly diversified revenue stream.
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