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Histidine
Definition 1
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. (NCI Thesaurus)
Definition 2
Amino acid with side chain -CH2-C3H3N2. (NCI Thesaurus/CRCH)
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