Ms. TRACY ZIMMERMAN (Scientist, Alnylam Pharmaceuticals): We dosed six animals at each dose level, and then we had a control group, which was just treated with saline alone.

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It too can be treated with painkillers, but other drugs such as low-level dose antidepressants and anticonvulsants can also help.

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There is a strong argument for ignoring radiation dangers below the level of the Denver dose.

WSJ: The Panic Over Fukushima

After all, she noted, only 1% of demand for Pfizer's Lipitor is at the 80-mg level, and the 40-mg dose of Crestor appears to be at least as powerful as the 80-mg dose of Lipitor.

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The question is whether one can find a dose that prevents thromboembolic strokes with the new generation anticoagulants at an acceptable level of bleeding.

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