Enables identical protein binding activity. Acts upstream of or within cellular response to xenobiotic stimulus. Located in myelin sheath. Is expressed in several structures, including alimentary system; central nervous system; genitourinary system; liver; and sensory organ. Used to study autism spectrum disorder. Human ortholog(s) of this gene implicated in several diseases, including autoimmune disease (multiple); eye disease (multiple); gastrointestinal system cancer (multiple); hematologic cancer (multiple); and lung disease (multiple). Orthologous to human GSTM1 (glutathione S-transferase mu 1). [provided by Alliance of Genome Resources, Apr 2022]