cystine /cys·tine/ (sis´tēn) (sis´tin) a sulfur-containing amino acid produced by digestion or acid hydrolysis of proteins, sometimes found in the urine and kidneys, and readily reduced to two molecules of cysteine.
cystine 
cys·tine (s s t n )n. A white crystalline amino acid that is found in many proteins, especially keratin, and is the major source of metabolic sulfur. |
cystine
[sis′tin]
a compound consisting of two cysteine residues joined by a disulfide (S-S) linkage. Compare cysteine.
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Chemical structure of cystine
cystine
a naturally occurring amino acid, an important sulfur-containing component of the protein molecule. It is sometimes found in the urine and in the kidneys in the form of minute hexagonal crystals, frequently forming cystine calculus in the bladder.
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Cystine stones. By permission from Nelson RW, Couto CG, Small Animal Internal Medicine, Mosby, 2003
cystine calculi
see cystine uroliths.
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