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Crossword clue: a crystalline amino acid found in proteins (especially keratin); discovered in bladder stones

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cystine 7 letters wn-def

a crystalline amino acid found in proteins (especially keratin); discovered in bladder stones

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A white crystalline substance, C3H7NSO2, containing sulphur, occuring as a constituent of certain rare urinary calculi, and occasionally found as a sediment in urine.