See also: Cysteine and cystéine

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Etymology edit

An alteration of cystine.

Pronunciation edit

IPA(key): /ˈsɪs.tɪ.iːn/

Noun edit

cysteine (countable and uncountable, plural cysteines)

Skeletal formula of L-cysteine.
Skeletal formula of D-cysteine.
  1. (biochemistry) A sulphur-containing nonessential amino acid C3H7NO2S found in most animal proteins; it readily oxidizes to cystine.

Usage notes edit

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

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