Mathematical Biology Section, NIDDK/LBM, National Institutes of Health, Bethesda, Maryland, United States of America.|Steroid Hormones Section, NIDDK/LERB, National Institutes of Health, Bethesda, Maryland, United States of America.|Steroid Hormones Section, NIDDK/LERB, National Institutes of Health, Bethesda, Maryland, United States of America.|Steroid Hormones Section, NIDDK/LERB, National Institutes of Health, Bethesda, Maryland, United States of America.|Steroid Hormones Section, NIDDK/LERB, National Institutes of Health, Bethesda, Maryland, United States of America.|Steroid Hormones Section, NIDDK/LERB, National Institutes of Health, Bethesda, Maryland, United States of America.