Protein extraction and Western blotting were conducted as previously described 19 (link), 21 (link), 22 (link). The antibodies used were affinity-purified rabbit anti-INHBB polyclonal antibody (Abcam, Cambridge, UK), mouse anti-GAPDH polyclonal antibody (Santa Cruz Biotechnology, Inc., Santa Cruz, CA, USA), rabbit anti-E-cadherin monoclonal antibody (Cell Signaling Technology, Danvers, MA, USA), and rabbit anti-Zonula occludens-1 (Zo-1) monoclonal antibody and rabbit anti-snail family transcriptional repressor 1 (Snail) monoclonal antibody (Cell Signaling Technology).