Sodiumdodecyl sulphate polyacrylamide gel electrophoresis (SDS-PAGE) and Western blotting were performed as described previously 5 (link). The following antibodies were used: MAD2 (BD BioScience, San Jose, CA, USA), HDAC6 (Millipore, Billerica, MA, USA), Caspase 3, p21, poly (ADP-ribose) polymerase (PARP), CDK6 and p-Rb (Ser 807/811) (Cell Signalling, Danvers, MA, USA), β-actin and p16 (Santa Cruz Biotechnology, Dallas, Texas, USA), beta (β)-galactosidase (Abcam, Cambridge, UK).
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