In this video, health-care analyst David Williamson discusses why Biogen Idec's party may just be getting started despite a huge run in the stock already. It has two hemophilia drugs under FDA review, but more importantly, its new groundbreaking multiple sclerosis drug is surpassing even the highest expectations of its launch.

David Williamson has no position in any stocks mentioned. Follow David on Twitter: @MotleyDavid.

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