GAD1 and type 1 diabetes mellitus: Furthermore, the serum of STZ-induced T1DM mice, treated with adoptively transferred nBMCs or adoptively transferred dBMCs, showed a significant increase in Zinc transporter 8 antigen protein (ZnT8), Islet antigen 2 protein (IA-2), and glutamic acid decarboxylase antigen protein (GAD) levels.