2.7. Western blotting

Western blotting was performed as previously described [21]. The primary antibodies used were as follows: rabbit anti‐DDX21 (1 : 500; Catalogue number A300‐629A; Bethyl Laboratories, Montgomery, TX, USA), rabbit anti‐CEP55 (1 : 500; Catalogue number 81693S; Cell Signaling Technology, Danvers, MA, USA) or mouse anti‐N‐Myc (1 : 1000; Catalogue number sc‐53993; Santa Cruz Biotechnology). The secondary antibodies used were as follows: goat anti‐rabbit (Catalogue number 12‐348) or goat anti‐mouse (Catalogue number 12‐349) (1 : 10 000; both from MERCK, Burlington, MA, USA). The anti‐actin antibody (1 : 15 000; Catalogue number A3853; Sigma) was used as loading control.