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Glucose and C-peptide profiles during an OGTT through the progression from healthy beta cells (a) to stage 1 (b), stage 2 (c) and stage 3 (d) type 1 diabetes (T1D). The time (years) to diagnosis of type 1 diabetes is based on the available evidence and is intended as approximative. IAA, islet autoantibody. This figure is available as part of a downloadable slideset
