DR MARK J. WINTER / SCIENCE PHOTO LIBRARY DR MARK J. WINTER / SCIENCE PHOTO LIBRARY
THG bound to receptor. Molecular model of a molecule of the anabolic steroid drug tetrahydrogestrinone (THG, ball-and-stick primary structure) bound to a human androgen receptor (secondary structure). THG, also known as The Clear, is the most powerful anabolic steroid synthesised (as of 2008). It binds to both androgen (male sex hormone) and progesterone (female sex hormone) receptors. Binding of THG to androgen receptors causes muscle tissue growth, leading to it being used illegally in competitive sports. Overuse of THG can cause infertility in males and females and suppression of the immune system.
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