Ch. 1. Universal Themes of Signal Transduction in Bacteria / Barry L. Taylor and Mark S. Johnson -- Ch. 2. Phosphorylation in Bacterial Chemotaxis / William R. McCleary and Jeffry B. Stock -- Ch. 3. Methylation-Independent Behavioral Responses in Bacteria / Judith P. Armitage -- Ch. 4. The Agrobacterium Ti Plasmid and Crown Gall Tumorigenesis: A Model for Signal Transduction in Host-Pathogen Interactions / Robert G. Ankenbauer and Eugene W. Nester -- Ch. 5. Signal Transduction Systems in Eukaryotic Microorganisms, Drosophila, and Nematodes / Janet Kurjan -- Ch. 6. ras and Signal Transduction during Sexual Differentiation in the Fission Yeast Schizosaccharomyces pombe / David A. Hughes and Masayuki Yamamoto -- Ch. 7. RAS Genes in the Budding Yeast Saccharomyces cerevisiae / Kelly Tatchell -- Ch. 8. Signal Transduction Pathway for Pheromone Response in Saccharomyces cerevisiae / Malcolm Whiteway and Beverly Errede -- Ch. 9. Lipopeptide Pheromones of Yeast and Basidiomycetes Involved in Mating / Wolfgang Duntze, Richard Betz and Bert Popping -- Ch. 10. Signal Transduction during Fertilization in Chlamydomonas / William J. Snell -- Ch. 11. Photoreception in Chlamydomonas / Peter Hegemann and Hartmann Harz -- Ch. 12. Paramecium Chemosensory Transduction / Judith Van Houten -- Ch. 13. Biochemistry and Genetics of Sensory Transduction in Dictyostelium / Peter J. M. Van Haastert and Peter N. Devreotes -- Ch. 14. Gene Regulation by Hormone-like Signals in Dictyostelium / Pauline Schaap, Dorien J. M. Peters, Bodduluri Haribabu and Robert P. Dottin -- Ch. 15. G Proteins of Drosophila melanogaster / James B. Hurley -- Ch. 16. Signal Transduction during Caenorhabditis elegans Vulval Determination / Raffi V. Aroian and Paul W. Sternberg