The GSTM5 (glutathione S-transferase Mu 5) gene codes for a 218 amino acid long, 25 kDA protein that functions as a catalyst in various reactions in eukaryotes and prokaryotes such as converting reduced gluthathione to a large number of exogenous and endogenous hydrophobic electrophiles. GSTM5 has been linked to various diseases such as hypertension, hepatitis, adenocarcinoma, breast cancer, coronary heart disease, and hypertension. GSTM5 participates in gluthione metabolism and conjugation as well as metapathway biotransformation and has been known to interact with various genes such as CYP1A1, CYP1B1, CYP2B6, CYP2C19, and ALDH1A3.