A single gene that regulates testosterone levels in a "crazy" species of shore bird controls the development of three wildly ...

anabolic-androgenic steroids -- are the synthetic derivatives of the naturally occurring male anabolic hormone testosterone. Both anabolic and androgenic have origins from the Greek: anabolic ...

Aa Aa Aa A widely used method for determining whether steroid hormones, like testosterone, affect aggression is to conduct long-term manipulations. Manipulations, such as castration and/or ...