This gene (GGT2P) appears to be a human duplication of the gamma-glutamyltransferase 1 (GGT1) gene. While GGT2P and GGT1 can potentially encode proteins of the same size and with 94% identity, the ability of GGT2P to encode a stable, functional enzyme has been disputed (see PMID:23682772). Since it is also expressed at a much lower level than GGT1, GGT2P is now thought to be a processed pseudogene. [provided by RefSeq, Jan 2022]