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...Section functional anatomy of the serotonergic system p ch indd pm chapter evolution serotonin sunlight to suicide efrain c azmitia department biology and psychiatry center for neuroscience new york university washington square east abstract is involved in many behaviors biological systems that are central human life extending from early developmental events related neurogenesis maturation apoptosis neurodegeneration underlie dementia death how can a single chemical be so powerful determining quality quantity this its biosynthetic pathways tryptophan examined essential components pathway highly conserved based chemicals including sero tonin melatonin auxin have important action differentiation mitosis survival cell organisms as complexity evolved into multicellular especially plants levels rose dramatically importance evident photosynthesis plant growth when animal kingdom began ability synthesize was lost dropped accordingly animals had develop special mechanisms secure their diets ca...