INS and type 1 diabetes mellitus: The expression of progenitor and embryogenic markers, Pdx1, Ngn3, Sox9 and Sox11, as well as specific β-cell markers Pdx1, Ins, Nkx6.1 and MafA mRNA levels using qRT-PCR were mirrored in naïve pancreatic exocrine cells using the same non-diabetic and T1D donors (Fig. 2).