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Wiktionary
cysteine

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

WordNet
cysteine

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

Wikipedia
Cysteine

Cysteine (abbreviated as Cys or C) is a semi- essential proteinogenic amino acid with the formula HOCCH(NH)CHSH>. It is encoded by the codons UGU and UGC. The thiol side chain in cysteine often participates in enzymatic reactions, as a nucleophile. The thiol is susceptible to oxidization to give the disulfide derivative cystine, which serves an important structural role in many proteins. When used as a food additive, it has the E number E920.

Usage examples of "cysteine".

Could memory, he wondered, truly be coded into chains of valine, cysteine and aspartic acid?

The abbreviations for cystine and cysteine are more cryptic and deserve some explanation, for they will be important later on.

Worcestershire sauce, hydrolyzed vegetable protein, monosodium glutamate, nonfat dry milk, dehydrated onions, flavoring, sugar, caramel color, spice, cysteine and thiamine hydrochloride, gum arabic.

Since most of the abbreviations consist of the first three letters of the name, they are not difficult to memorize: glycine gly alanine ala valine val leucine leu asparagine asp'Ntb aspartic acid asp glutamine ghrNH2 glutamic acid glu THE HUMAN BRAIN isoleucine proline phenylalanine tyrosine tryptophan serine threonine ileu pro phe tyr try ser thr lysine histidine lys his arginine methionine arg met cystine cysteine cy-S-cy-SH Of the abbreviations that are more than the first three letters of the names, ileu, asp-NH2, and ghrNH2 should be clear.