Current Topics in Cellular Regulation, Volume 15 deliberates the basic mechanisms involved in the regulation of diverse cellular activities. This book discusses the kinetics and thermodynamics of cGMP binding to G-kinase, activation of cyclic nucleotide phosphodiesterase, and polymeric forms of phosphofructokinase. The genetic control of pentose phosphate pathway enzymes in drosophila, discrepancies in the interpretation of the ODC assay, and comparison of chemotaxis in leukocytes and other cells are also elaborated. This publication likewise covers the biochemical aspects of neurosecretion and neurophysin-neurohormone complexes. This volume is valuable to biologists and researchers concerned with advances in the general area of cellular regulation.