One of the essential amino acids, first isolated in 1896. It occurs abundantly in hemoglobin and can be isolated from blood cells. It is used in medicine and biochemical research and as a dietary supplement and feed additive
An amino acid Precursor to histamine, a vasodilator and gastric juice stimulant Has been used as a therapeutic aid for arthritis
(His or H) Click the name to see a model of the side chain group for this amino acid