from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. An amino acid, C3H7O2NS, derived from cystine and found in most proteins.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A sulphur-containing nonessential amino acid C3H7NO2S found in most animal proteins; it readily oxidizes to cystine.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. an amino acid containing sulfur that is found in most proteins; oxidizes on exposure to air to form cystine


Alteration of cystine.
(American Heritage® Dictionary of the English Language, Fourth Edition)
An alteration of cystine. (Wiktionary)



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  • part of homocysteine; a still arguable indicator of cardiovascular disease.

    September 21, 2008