Term Name:	C-terminal S-(Gly-Gly)-L-Cys zwitterion residue
Synonyms:	C-terminal Gly-NH-CH(2)-C(O)S-L-Cys
Definition:	A zwitterionic group obtained by transfer of a proton from the carboxy to the amino group of C-terminal S-(Gly-Gly)-L-Cys residue; major species at pH 7.3.
Ontology:	ChEBI [CHEBI:90783]  ( EBI )