DAB, or 3,3-diaminobenzidine tetrahydrochloride, EASY tablets for immunohistochemistry, CAS # 7411-49-6, is a chromogenic substrate used to observe peroxidase activity. In immunohistochemistry, DAB is used to catalyze peroxidase-bound antibodies in order to visualize protein presence. | CAS: 7411-49-6