different between cysteine vs nitrosocysteine

English

An alteration of cystine.

cysteine (countable and uncountable, plural cysteines)

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

When used as the name of a substance, this noun is uncountable, but when used as the name of individual molecules, it is countable.

nitroso +? cysteine

nitrosocysteine (uncountable)

(biochemistry) A nitroso derivative of cysteine, derived from the endothelium that acts as a vasorelaxant

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