An oxidation product of cysteine, and a precursor of taurine and isethionic acid. SYN: 3-sulfoalanine.
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cys·te·ic acid 'sis-tē-ik- n a crystalline amino acid C3H7NO5S formed by oxidation of cysteine or cystine and yielding taurine on decarboxylation
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cys·te·ic ac·id (sis-teґik) an intermediate formed by oxidation of the thiol group of cysteine to a sulfo group, and precursor of taurine.Medical dictionary. 2011.