|AAA, AAG, basic side chain|
|nutritionally nonessential amino acid found mainly in collagen|
histidine his·ti·dine (hĭs'tĭ-dēn', -dĭn)
An amino acid that is essential for tissue growth and repair.
|histidine (hĭs'tĭ-dēn') Pronunciation Key
An amino acid that is essential for children but not for adults. Chemical formula: C6H9N3O2.