SLC2A4 and Insulin resistance: Four of these loci, all not previously implicated in post-challenge insulin resistance, were significantly associated with IFC (N = 52,474; SLC2A4, PPP1R3B, C2CD4A and MTNR1B;Figure 1; Table 1; Supplementary Figures 3, 4 and 6; Supplementary Table 6 and 7).