Contents 
427 Structural Studies of Protein-Nucleic Acid Interaction 
Thomas A. Steitz, Ph.D. 
431 Pattern Formation and Neuronal Cell Recognition in the Drosophila 
Visual System 
Hermann Steller, Ph.D. 
433 Molecular Genetics of Nematode Development and Behavior 
Paul W. Sternberg, Ph.D. 
435 How the Brain Modifies Its Own Circuits: Synaptic Neuromodulation 
Charles F. Stevens, M.D., Ph.D. 
437 Morphogen Gradients and the Control of Body Pattern in Drosophila 
Gary Struhl, Ph.D. 
439 Molecular Mechanisms of Neurotransmitter Release 
Thomas C. Siidhof, M.D. 
441 Genes Responsive to Growth Factors 
Vikas P. Sukhatme, M.D., Ph.D. 
443 The Molecular Biology of Liver Regeneration 
Rebecca A. Taub, M.D. 
445 Molecular Regulation of Lymphoid Cell Growth and Development 
Craig B. Thompson, M.D. 
447 The Molecular Basis of Metamorphosis 
Carl S. Thummel, Ph.D. 
449 The Regulation of Development 
Shirley M. Tilghman, Ph.D. 
451 Mechanisms of Gene Regulation in Animal Cells 
Robert Tjian, Ph.D. 
453 Development and Function of T Cells 
Susumu Tonegawa, Ph.D. 
455 Molecular Engineering Applied to Cell Biology and Neurobiology 
Roger Y. Tsien, Ph.D. 
457 Genetic Defects in the Metabolic Pathways Interconnecting the Urea and 
Tricarboxylic Acid Cycles 
David L. Valle, M.D. 
459 The Molecular Physiology of Calcium 
D. Martin Watterson, Ph.D. 
461 MyoD: A Master Regulatory Gene for Myogenesis 
Harold M. Weintraub, M.D., Ph.D. 
