GAD1 and diabetes mellitus: In 100 youth with diabetes (median age at assessment 15 y.o. and 8 years diabetes duration) IA2 and GAD status was known in 85 participants: (60 (70.5%) were positive for ≥ 1 auto antibody), 47% were GAD positive, of whom 39% had detectable C-peptide, while 44% were IA2 positive, of whom 40% had detectable C-peptide.