Noun
pyrrolysine (uncountable)
(biochemistry) An amino acid found in methanogenic bacteria.
Selenocysteine is now viewed as the 21st amino acid, and pyrrolysine is viewed as the 22nd. Source: Internet
Transcription of this codon is enabled by the proximity of the SECIS element (SElenoCysteine Incorporation Sequence). citation The UAG codon can translate into pyrrolysine in a similar manner. Source: Internet