Steroid hormones are produced at the sites of action.
Hironobu
H
Sasano
D001943:Breast Neoplasms / Q000503:physiopathology; D004967:Estrogens / Q000502:physiology; D005260:Female; D006728:Hormones / Q000096:biosynthesis* / Q000502:physiology*; D006801:Humans; D009376:Neoplasms, Hormone-Dependent / Q000503:physiopathology
D004967:Estrogens; D006728:Hormones