The GST superfamily is made up of several subfamilies. Glutathione Stransferase P (GSTP1) belongs to the π subfamily and is involved in the conjugation of reduced glutathione to a variety of endogenous and exogenous hydrophobic electrophiles. Glutathione S-transferase μ 1 (GSTM1) is a cytoplasmic liver protein belonging to the μ family and has the same basic functions as GSTP1-1. Glutathione S-transferase θ 1 (GSTT1), a cytoplasmic homodimer belonging to the θ family, is expressed in erythrocytes. It is active in the reduced glutathione conjugation and also displays glutathione peroxidase activity with cumene hydroperoxide.Synonyms: GST class-theta-1, Glutathione S-transferase theta-1, Glutathione transferase T1-1