The following video is part of our "Motley Fool Conversations" series, in which health-care editor/analyst David Williamson discusses topics across the investing world.

In this video, David takes a closer look at biotech's two worst stocks in 2012. Beaten down companies are often underperforming for a reason, but sometimes the negativity provides a nice entry point. Shares for both of these companies are off more than 50% after trial difficulties -- watch and discover which is a stay away and which may be a possible buy. 

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