U.S. Department of Health & Human Services Divider Arrow National Institutes of Health Divider Arrow NCATS

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Class (Stereo):
CHEMICAL (ABSOLUTE)


Cysteine (cysteine hydrochloride is a salt) is a thiol-containing amino acid that is oxidized to form cystine. Cysteine is synthesized from methionine via the trans-sulfuration pathway in the adult, but newborn infants lack the enzyme, cystathionase, necessary to effect this conversion. Therefore, cysteine is generally considered to be an essential amino acid in infants.