Volume 45 of Advances in Enzyme Regulation is the proceedings of the 45th International Synthesis in Normal and Neoplastic Tissues held at Indiana University School of Medicine Indianapolis, Indiana September 27-28, 2004. Volume 45 concentrates on subjects which have reached the stage of productive summarizaiton and critical evaluation in the light of extensive new results. This book also lives up to its goal of advancing a few steps ahead of the general front of mammalian enzymic and metabolic regulation studies.