human growth hormone (hgh, somatotropin) molecule. natural hormone that is used both as a drug and as a doping agent. cartoon

3d abuse acid amino anabolic athlete atoms biochemical biochemistry biotech biotechnology chemical chemistry crystal deficiency disease doping drug enhancing gh growth health hgh hormone human macromolecule model molecular molecule pdb1hgu peptide performance polymer polypeptide protein science scientific sheet somatotropin somatropin sports strand structure wada