Contents 
389 Lymphocyte Surface Antigens in Health and Disease 
Benjamin D. Schwartz, M.D., Ph.D. 
391 Second Messenger Pathways in Identified Neurons 
James H. Schwartz, M.D., Ph.D. 
395 Three-Dimensional Structure of Eukaryotic Chromosomes 
John W. Sedat, Ph.D. 
397 Molecular Basis of Familial Hypertrophic Cardiomyopathy: Cardiac 
Myosin Heavy-Chain Gene Mutations 
Jonathan G. Seidman, Ph.D. 
399 Computational Neurobiology of the Hippocampus 
TerrenceJ. Sejnowski, Ph.D. 
401 The Mammalian Sex Chromosomes 
Larry J. Shapiro, M.D. 
403 Adenovirus as a Model for Oncogenesis and Control of Gene Expression 
Thomas E. Shenk, Ph.D. 
405 Growth Control of Myeloid Cells 
Charles J. Sherr, M.D., Ph.D. 
407 Modulation of Internal Calcium and Synaptic Function 
by Neurotransmitters 
Steven A. Siegelbaum, Ph.D. 
409 Chemical Details of Cellular Regulation 
Paul B. Sigler, M.D., Ph.D. 
411 Regulation of Gene Activity During B Cell Development 
Harinder Singh, Ph.D. 
413 Regulation of Gene Expression in Developing Lymphocytes 
Stephen T. Smale, Ph.D. 
415 Developmental Genetics 
Philippe M. Soriano, Ph.D., D.Sc. 
41 7 Understanding How Eggs Work 
Allan C. Spradling, Ph.D. 
421 Structural Studies of Proteins Involved in Hormonal 
Signal Transduction 
Stephen R. Sprang, Ph.D. 
423 The Production and Actions of Insulin and Other Islet Hormones 
Donald F. Steiner, M.D. 
425 Autoantibody Probes for Mammalian Gene Expression 
Joan A. Steitz, Ph.D. 
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