Contents. List of Contributors. The Dictyostelium Discoideum Plasma Membrane: A Model System for the Study of Actin-Membrane Interactions (E.J. Luna, L.J. Wuestehube, H.M. Ingalls, and C.P. Chia). Tektins and Microtubules (R.W. Linck). The Elusive Organization of the Spindle and the Kinetochore Fiber: A Conceptual Retrospect (A.S. Bajer). Talin: Biochemistry and Cell biology (K. Burridge and L. Molony). Digital Imaging Fluorescence Microscopy: Statistical Analysis of Photobleaching and Passive Cellular Uptake Processes (Z.Jericevic, B. Wiese, R. Homan, J. Bryan, and L.C. Smith). Clathrin Assembly Proteins and the Organization of the Coated Membrane (J.H. Keen). Control of Mast Cell Secretion (D. Lagunoff). Pattern Formation: The Differentiation of Pigment Cells from the Embryonic Neural Crest (S.K. Frost). Experimental Analysis of Centrosome Reproduction in Echinoderm Eggs (G. Sluder). Multiple Pathways of Protein Secretion in Exocrine Cells (J.D. Castle).