F-box-like protein which is required for entry into mitosis. Acts by participating in E3 ligase complexes that mediate the ubiquitination and degradation of WEE1 kinase at G2/M phase. Protein modification; protein ubiquitination. Interacts with wee1, when wee1 is phosphorylated at 'Ser-38'. Present at high level in G2 and M phases but declines rapidly in G2 phase (at protein level). The KEN box is required for the association with the APC/C-Cdh1 complex. Phosphorylated. Ubiquitinated and degraded by the APC/C-Cdh1 complex during G1 phase.