Biogenic monoamines—molecules like dopamine and serotonin—are famous for their role as the brain’s emissaries of mood, learning and memory, stress mechanisms, and fight-or-flight responses in the body. Biogenic monoamines—molecules like dopamine and serotonin—are famous for their role as the brain’s emissaries of mood, learning and memory, stress mechanisms, and fight-or-flight responses in the body. Cell & Microbiology Molecular & Computational biology Phys.org – latest science and technology news stories