Moreover, proportions of neurons that responded to FGF19 did not differ between groups for both Rin (Control; Responsive: 29; Non-responsive: 31; T1DM; Responsive: 13, Non-responsive: 13; p>0.99; Fisher’s exact test) and RMP (Control; Responsive: 24; Non-responsive: 36; T1DM; Responsive: 12; Non-responsive: 14; p = 0.63; Fisher’s exact test). This evidence concerns the gene FGF19 and type 1 diabetes mellitus.