BUB1 and cervical squamous intraepithelial neoplasia: However, even if we identified that BUB1 indeed phosphorylated KIF14 Ser1292 in several experiments, and we confirmed the important role of KIF14 Ser1292 in maintaining CIN, we still could not ignore the possibility of other phosphorylation sites of KIF14 was phosphorylated by BUB1, since the phosphorylation band still exist in the KIF14ΔSer1292 mutant group in our Phos‐tag analyses, which was directly displayed in the in vitro kinase experiment.