Current Topics in Cellular Regulation, Volume 2 presents the fundamental mechanisms involved in the regulation of diverse cellular activities, including cellular differentiation, intermediary metabolism, and the transfer of genetic information. This book provides information pertinent to the various aspects of cellular regulation. Organized into eight chapters, this volume begins with an overview of the occurrence of the enzyme in plants and microorganisms. This text then examines the biosynthesis of aromatic amino acids and vitamins, which is proving an interesting model system for the study of regulation. Other chapters consider the control of cholesterol biosynthesis in normal tissues, with emphasis on the pathologic implications of derangements of cholesterol feedback control. This book discusses as well the aspects of the biogenesis of yeast mitochondria. The final chapter deals with regulation in the pyrimidine biosynthetic pathway at the level of enzyme activity. This book is a valuable resource for biochemists, biologists, and research workers.