Has roles in respiratory and lipid metabolism. glutathione + RX = a halide anion + an S-substituted glutathione + H(+) Expressed in the pharynx, body wall muscles and epidermis. Weaker expression is seen in the intestine. Significant decrease in respiration rate and a lower concentration of the monounsaturated fatty acid cis-vaccenic acid. Belongs to the GST superfamily. Kappa family.