... checkpoint slidingclamp, comprising Rad17, Ddc1, and Mec3 in S. cerevisiae (Rad1, Rad9, and Hus1 in S. pombe) (136–138). Both the checkpoint loading complex and the checkpoint slid-ing clamp ... yeast and budding yeast spindle checkpointshave been identified, and the Aurora kinase, Ark1, is involved in monitoring unat-tached kinetochores in fission yeast, (164), whereas the related kinase, ... Chi, Y., Catarin, B., Herskowitz, I., Deshaies, R. J., and Peter, M. (1997)Phosphorylation- and ubiquitin-dependent degradation of the cyclin-dependent kinase in- hibitor Far1p in budding yeast....