Fig. 1. Intravenous glucose infusion rates during an isoglycemic intravenous glucose infusion (IIGI) study in subjects with (A) normal glucose tolerance (NGT) or (B) type 2 diabetes mellitus (T2DM). Plasma glucose profiles of oral glucose tolerance test (OGTTs) (filled symbol) and IIGI studies (open symbol) in subjects with (C) NGT or (D) T2DM. Adapted from Oh et al. [21], with permission from John Wiley and Sons.