CAT and type 1 diabetes mellitus: Studies on the concentration of Mg, Mn, Zn, Se, and Cu in the plasma, and the concentration of zinc-copper superoxide dismutase (CuZn-SOD), catalase (CAT), and glutathione peroxidase (SeGSH-Px) in erythrocyte hemolysates in T1DM patients and their siblings showed that, compared to the control group, children with T1DM had lower plasma levels of Mg and Zn, lower zinc-copper superoxide dismutase (CuZnSOD) and higher levels of Cu.