Cover illustration: regional sources of saponins, and their role in the development of oral contraceptive steroids.
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Huxtable
D003278:Contraceptives, Oral, Hormonal / Q000138:chemical synthesis / Q000266:history*; D049673:History, 20th Century; D006801:Humans; D008800:Mexico; D010946:Plants, Medicinal; D012503:Saponins / Q000737:chemistry / Q000266:history*; D013256:Steroids / Q000138:chemical synthesis / Q000266:history*; D014481:United States
D003278:Contraceptives, Oral, Hormonal; D012503:Saponins; D013256:Steroids