Contents. List of Contributors. Preface (M. Whitaker). Centrosomes and the Cell Cycle (G. Sluder). Regulation of Centrosome Function During Mitosis (R.M. Tombes and G.G. Borisy). Calcium and Calmodulin Regulation of the Nuclear Division Cycle of Aspergillus Nidulans (K.P. Lu, N.N. Nanthakumar, J.S. Dayton, and A.R. Means). Cell Cycle Control by Protein Phosphatase Genes (M. Yanagida). The cdc25 Phosphatase: Biochemistry and Regulation in the Eukaryotic Cell Cycle (I. Hoffmann, P.R. Clarke, and G. Draetta). Control of Nuclear Lamina Assembly/Disassembly by Phosphorylation (M. Peter and E.A. Nigg). Dissection of the Cell cycle Using Cell-Free Extracts from Xenopus Laevis (C.C. Ford and H. Lindsay). Index.