In this video, Motley Fool health care analyst David Williamson takes a look at three biotech stocks making moves today and what you should know about them. Sequenom (NASDAQ: SQNM ) made a big jump today despite higher-than-expected losses because of continued interest in its MaterniT21 Down syndrome test. SciClone Pharmaceuticals (NASDAQ: SCLN ) released some disappointing numbers. And ISIS Pharmaceuticals (NASDAQ: IONS ) is up 15% after a recent buy rec from Cowen, but Williamson warns that there are some mitigating factors around ISIS that should curb investors' enthusiasm.
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