selenocysteine

noun
sel·​e·​no·​cys·​teine | \ ˌsel-ə-nō-ˈsis-tə-ˌēn How to pronounce selenocysteine (audio) \

Medical Definition of selenocysteine

: a cysteine analog C3H7NO2Se in which one atom of sulfur has been replaced with one atom of selenium

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