Contents. List of Contributors. Acknowledgements. Antibody Specificity and Diversity Part II: The Genes (L.A. Steiner). From Transplant to Transcript (C. Tickle). The Discovery of Repair in DNA (B. Cox). Evolution in an RNA World (P. Schuster). Biological Nitrogen Fixation (P.S. Nutman). Plant Hormones: A History of Discovery and Scientific Fashion (D.J. Osborne). Pumps, Channels, and Carriers: From "Active Patches" to Membrane Transport Proteins (R. Boyd). Biochemistry Then and Now (M.G. Ord and L.A. Stocken). Subject Index.