PADI4 and type 1 diabetes mellitus: Padi4 (peptidyl arginine deiminase, type IV) [54], cdc42 [55], Frap1 (FK506 binding protein 12-rapamycin associated protein 1), and Slc9a1 (solute carrier family 9 member 1) [56] are not likely to be good candidates for T1D.