Protein extraction and western blot were performed as previously described(68 (link)). Antibodies for FOXN4 (#PA539174, ThermoFisher), ONECUT2 (#ab28466, Abcam), POU3F2 (#12137, Cell Signaling Technology), EGFR (#4267, Cell Signaling Technology), ASCL1 (#556604, BD), NEUROD1 (#ab109224, Abcam), pAKT (S473, #4060S, Cell Signaling Technology), pPRAS40 (T246, #13175, Cell Signaling Technology), Beta catenin (#8480, Cell Signaling Technology), Vinculin (#13901, Cell Signaling Technology) and actin (#3700, Cell Signaling Technology) were used.