Song, Jing Xu, Shuijun Zhang, Hongyang Wang, Jing FuAbcam, 1:300 for IHC; ab207327, Abcam, 1:500 for IF), CK7 (NBP2‐44814, Novus Biologicals, 1:50), Flag (14793S, Cell Signaling Technology, 1:500), β‐catenin (17565‐1, Proteintech,...