Cystine meaning

sĭs'tēn'
A white crystalline amino acid, C6 H12 N2 O4 S2 , formed from the disulfide linkage of two cysteines during folding of many proteins, especially keratin, and stabilizing the tertiary structure of the protein.
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A nonessential amino acid, C4H6(NH2)2S2(COOH)2
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A white crystalline amino acid, C6 H12 N2 O4 S2 , that is formed from the disulfide linkage of two cysteines during the folding of many proteins, especially keratin, and stabilizes the tertiary structure of the protein.
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(chemistry) A nonessential amino acid formed by the oxidation of cysteine; it contains two cycteine residues linked by a disulfide bond.
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Origin of cystine

From Ancient Greek κύστις (kustis, “bladder”), where it was found.