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cystine

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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.
cys·tine (sstn)
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.
Chemical structure of cystineenlarge picture
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.
Enlarge picture
Cystine stones. By permission from Nelson RW, Couto CG, Small Animal Internal Medicine, Mosby, 2003

cystine calculi
see cystine uroliths.


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Gram-negative oxidase-positive and catalase-positive cocci were then inoculated onto cystine trypticase agar.
Researchers are also focusing on increasing methionine, cystine and lysine for improved animal nutrition.
What we're really selling is a good balance of amino acids--particularly the sulfur amino acids like methionine and cystine to poultry and lysine to hogs.
 
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