Gamma-glutamyltransferase 4 [Precursor], EC 2.3.2.2, Gamma-glutamyltranspeptidase 4, GGT 4, Gamma-glutamyltransferase-like 3, Gamma-glutamyltransferase-like 5, Gamma-glutamyltransferase 4 heavy chain, Gamma-glutamyltransferase 4 light chain, GGTL3, GGTL5