CAT and alopecia areata: Abbreviations: AA = alopecia areata, ROS = reactive oxygen species, H2O2 = hydrogen peroxide, TBARS = thiobarbituric acid rective substances, MDA = malondialdehyde, TBARS = thiobarbituric acid-reactive substances, SOD = superoxide dismutase, CAT = catalase, GSH-Px = glutathione peroxidase, PON1 = paraoxonase 1, HO-1 = hemoxigenase 1, TrxR = thioredoxin reductase, GSH = glutathione