Considerable advances have been made recently in our understanding of how the cell cycle timing of mitosis is regulated. This has come about because links have been established between two independent areas of research, one based on a genetic approach using the fission yeast Schizosaccharomyces pombe and the second based on a biochemical approach using Xenopus and starfish oocytes. In this chapter we review work that has identified a number of the mitotic regulating genes in fission yeast and has established links with controls operative in multicellular eukaryotes.

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