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[mass noun] A compound which is an oxidized dimer of cysteine and is the form in which cysteine often occurs in organic tissue.
- ‘Glutathione conjugation uses Nacetylcysteine, cysteine, and methionine; cystine is used for sulfation; and glucuronidation requires pantothenic acid.’
- ‘In 1812, William Hyde Wollaston found a substance in urine that he identified as a cystic oxide, and was later named cystine.’
- ‘Once inside a cell, cystine is rapidly reduced to cysteine that, as a precursor of GSH, undergoes GSH synthesis.’
- ‘The sulfur-containing amino acids are methionine, cysteine, cystine, homocysteine, homocystine, and taurine.’
- ‘Cysteamine enters the lysosomes by a specific transporter and converts cystine to cysteine and cysteine-cysteamine mixed disulfide.’
- ‘The proteins of soyabean yields all essential amino acids in adequate amounts, except methionine and cystine.’
- ‘Decomposition of urine containing cystine or pus will have the odor of rotten eggs.’
- ‘Stones can be composed of calcium, oxalate, urate, cystine, xanthine, phosphate, or all of these.’
- ‘Cysteine in the extracellular space is mostly oxidized to cystine.’
- ‘Zinc is required for the incorporation of cystine into keratin.’
Mid 19th century: from Greek kustis bladder (because it was first isolated from urinary calculi) + -ine.
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