Western blotting was performed according to the standard protocol (21 (link)) with the following antibodies: EPB41L3 (1:2,000; Abcam, Cambridge, MA, USA), caspase-8 (1:1,000), caspase-9 (1:1,000), caspase-3 (1:1,000), CyclinA (1:2,000), CyclinD (1:1,000), CyclinE (1:1,000) (all from Cell Signaling Technology, Inc., Danvers, MA, USA), CyclinB1 (1:1,000), Cyclin-dependent kinase 1 (CDK1, also known as Cdc2; 1:1,000) (both from ProteinTech Wuhan Sanying Biotechnology, Wuhan, China). GAPDH (1:8,000; ProteinTech Wuhan Sanying Biotechnology) was used as loading control.