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/ˈsɪs.təˌiːn/ · noun
(biochemistry) A sulphur-containing nonessential amino acid C₃H₇NO₂S found in most animal proteins; it readily oxidizes to cystine..
Use cysteine when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Cysteine means (biochemistry) A sulphur-containing nonessential amino acid C₃H₇NO₂S found in most animal proteins; it readily oxidizes to cystine..
Common synonyms include E910 when used as a food additive, E920 when used as an improving agent, Cys when viewed as a monomer in proteins.
The opposite depends on the specific sense.
Use cysteine where its definition matches the intended context.
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