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　　Not so, according to Phyllis Greenberger, president of the Society for Women's Health Research.

　　"When researchers have looked at sex differences, they sometimes find that something works better in a man versus a woman or the other way around," she said. "So it's not just about women anymore. It's really understanding the mechanism of disease."

　　Lobbying efforts by women's health advocates led Congress to pass a law in the 1990s requiring federally-funded research to include more women in large clinical trials.

　　Before then, it was widely believed that what works in men works for women.

　　Janine Austin Clayton, an ophthalmologist by training who directs the Office of Research on Women's Health at the National Institutes of Health, says participants in NIH-funded research now include an equal number of men and women.