NCIt related terms : (S)-2-Amino-3-(1H-imidazol-4-yl)propanoic acid; His;
NCIt definition : A semi-essential amino acid (children should obtain it from food) needed in humans
for growth and tissue repair, Histidine is important for maintenance of myelin sheaths
that protect nerve cells and is metabolized to the neurotransmitter histamine. Histamines
play many roles in immunity, gastric secretion, and sexual functions. Histidine is
also required for blood cell manufacture and protects tissues against damage caused
by radiation and heavy metals. (NCI04);
Alternative definition : CRCH: Amino acid with side chain -CH2-C3H3N2.;