a nonessential amino acid, HSCHCH(NH)COOH, derived from cystine
An amino acid, C3H7O2NS, derived from cystine and found in most proteins.
Origin of cysteineAlteration of cystine
(countable and uncountable, plural cysteines)
When used as the name of a substance, this noun is uncountable, but when used as the name of individual molecules, it is countable.
An alteration of cystine.