GAD2 and type 1 diabetes mellitus: In contrast, the German BABYDIAB Study has demonstrated that offspring born to mothers with T1D who were positive for autoantibodies against islet-specific autoantigens linked to T1D (namely GAD65 and/or tyrosine phosphatase-related islet antigen 2 tyrosine phosphatase-related islet antigen 2, IA-2) at birth were at lower risk of T1D than offspring who were autoantibody-negative.