The primary tissue lysates and whole cell lysates were prepared for immunoblotting as described previously 25 (link). Equal amounts of total proteins (30 µg) were subjected to SDS-PAGE and immunoblotting analysis with specific antibodies. The primary antibody against Cyclin D1 was purchased from Cell Signaling Technology (Danvers, MA). Anti-USP5 antibody was obtained from Proteintech Group (Wuhan, China). Anti-TUFM and anti-EBF1 antibodies were purchased from ABclonal Biotechnology (Hubei, China). Anti-Flag, Myc and HA antibodies were purchased from Medical & Biological Laboratories (Tokyo, Japan). Anti-GAPDH antibody was purchased from Abgent Biotechnology (Suzhou, China). Horseradish peroxidase-conjugated anti-mouse and anti-rabbit IgG antibodies were purchased from Beyotime Biotechnology (Nantong, China).