Contents 
429 Genetic Defects in the Metabolic Pathways Interconnecting the Urea 
and Tricarboxylic Acid Cycles 
David L. Valle, M.D. 
431 Human Molecular Genetics in Two X-linked Diseases 
Stephen T. Warren, Ph.D. 
433 The MyoD Gene Family: A Nodal Point During Specification of Muscle 
Cell Lineage 
Harold M. Weintraub, M.D., Ph.D. 
435 Structural and Functional Studies of the T Cell Antigen Receptor 
Arthur Weiss, M.D., Ph.D. 
437 Following the Life History of Lymphocytes 
Irving L. Weissman, M.D. 
439 Function and Regulation of the Cystic Fibrosis Transmembrane 
Conductance Regulator 
Michael J. Welsh, M.D. 
441 Identification of the Gene Responsible for Adenomatous Polyposis 
Raymond L. White, Ph.D. 
443 Mechanisms of the Biological Activities of Membrane Glycoproteins 
Don C. Wiley, Ph.D. 
445 Studies of Blood Cell Formation 
David A. Williams, M.D. 
447 Growth Factor-stimulated Cell Proliferation 
Lewis T. Williams, M.D., Ph.D. 
449 Somatic Cell Gene Transfer 
James M. Wilson, M.D., Ph.D. 
453 Normal and Abnormal Lymphocyte Growth Regulation 
Owen N. Witte, M.D. 
455 Translational Regulation 
Sandra L. Wolin, M.D., Ph.D. 
457 Molecular Genetics and Studies Toward Gene Therapy 
for Metabolic Disorders 
Savio L. C. Woo, Ph.D. 
455^ Paracrine Control of Blood Vessel Function: Role of the Endothelins 
Masashi Yanagisawa, M.D., Ph.D. 
461 Mechanism of Phototransduction in Retinal Rods and Cones 
King-Wai Yau, Ph.D. 
463 Molecular Mechanisms of Ion Channel Function 
Gary Yellen, Ph.D. 
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