On the other hand, thousands of drugs have been developed for treatment of age-related diseases (obesity, hypertension, atherosclerosis, cardiac arrhythmias an so on) either semi-empirically or by intentional development of inhibitors of prostaglandin synthesis, beta-receptor, growth-factor receptors, angiotensin II, testosterone signal-transduction pathways. The gene discussed is AGT; the disease is obesity due to melanocortin 4 receptor deficiency.