For example, T2D risk variants map to HNF1A, HNF1B, HNF4A, MNX1, NEUROG3, PAX4, and PDX1 (Flannick et al., 2019; Mahajan et al., 2018; Steinthorsdottir et al., 2014), which are all transcription factors also expressed in pancreatic developmental precursors. This evidence concerns the gene PAX4 and type 2 diabetes mellitus.