This is a multi-center, prospective, non-interventional study that focuses on the long- term effects following participation in selected ITN new-onset Type1 Diabetes Mellitus studies with immunomodulatory agents (T1DM, T1D). This observational study will: * follow participants to determine how long they continue to produce insulin, and * will also assess how changes in the immune system over time relate to the ability to produce insulin. This information could help design better therapies for type 1 diabetes in the future.
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Change in Beta Cell Function by MMTT-Stimulated Mean C-peptide Area Under the Curve (AUC)
Timeframe: Baseline (Visit 0) to Month 60 (Year 5)