after reaching several years of age, humans begin to synthesize it (most likely in the intestinal micrflora) and it thus becomes a non-essential amino acid. humans can obtain histidine through the breakdown of carnosine (a dipeptide containing histidine and beta-alanine) via the action of carnosine dipeptidase.
Parent Term
Biochemical pathway
Parent Definition
A linked series of chemical reactions that occur in a defined order within or between organism cells, and lead to a known function or end product.