MAPK3 and cancer: To determine if the effect of NUAK1 suppression on centrosome number was cancer cell‐specific, we used floxed Nuak1fl/fl MEFs [38] stably expressing 4‐OH‐Tamoxifen‐inducible CRE recombinase fused to the modified ligand binding domain of the oestrogen receptor, CRE‐ERT2 [39].