Volume 42 lives up to its goal of advancing a few steps ahead of the general front of mammalian enzymic and metabolic regulation studies. This volume contains papers of 25 outstanding scientists working at the cutting edge of metabolic regulation. Much of the volume focuses on novel aspects of signal transduction with an emphasis on nuclear expression. One of the highlights of this volume is the Special Symposium Lecture. This was given for 15 years by Sir Hans A. Krebs who passed away 20 years ago. It was now given by Professor Sir Hans L. Kornberg, University Professor at Boston University. These volumes continue to be a source of information and inspiration and a laboratory and advanced teaching companion. The immediate and long-range significance of these cutting-edge presentations of these novel topics should be immediately clear to the reader.