The US Public Health Service noted in 1985 that lack of knowledge about female biology compromises the health of women. But until the 1990s, biomedical research was primarily rooted in the male model—the belief that male biology (outside of the reproductive system) was representative of the species. In 1993, Congress passed the NIH Revitalization Act, mandating that women and minorities be included in all clinical research, and requiring that Phase III clinical trials be analyzed by sex. Subsequently, a 2001 Institute of Medicine (IOM) report [1] unequivocally stated that “every cell has a sex,” and research should take sex differences into consideration from “womb to tomb.”