Discovered restriction enzymes, the so-called "biochemical scissors," which gave birth to the entire new field of genetic ... Induced apparently normal human brain cells to multiply in the test tube, opening the possibility that such cells could be used ... Where the drugs had long been thought to exert their clinical effects by increasing synaptic concentrations of serotonin and ... Described the structure and function of the complement system, a complex set of enzymes which play an important role in human ...