Keywords: پراکسیداز گیاهی; Ancestral protein; Plant peroxidase; Thermal stability; Oxidative stabilityBCA, bicinchoninic acid; GP, grandparent; HRP, horseradish peroxidase; IPTG, isopropyl β-d-1-thiogalactopyranoside; MRCA, most recent common ancestor; MYA, million years ago; Ni–NT