Contents 
187 Position-Dependent Gene Expression in Drosophila 
Tulle I. Hazelrigg, Ph.D. 
189 Control of Gene Expression During the Cell Cycle and in the Developing 
Mammalian Cerebellum 
" Nathaniel Heintz, Ph.D. 
191 Rihonuclease H and Genetic Replication 
Wayne A. Hendrickson, Ph.D. 
195 Chromosome Organization and Gene Function in Drosophila 
Steven Henikoff, Ph.D. 
195 The Evolution and Biological Roles of Complement Receptors 
V. Michael Holers, M.D. 
197 Genetic Control of Nematode Development 
H. Robert Horvitz, Ph.D. 
201 Protein Folding In Vivo 
Arthur Horwich, M.D. 
203 Molecular Mechanisms in the Regulation of Synaptic Transmission 
Richard L. Huganir, Ph.D. 
205 Molecular Aspects of Signal Transduction in the Visual System 
James B. Hurley, Ph.D. 
207 Nectins and Integrins: The Molecular Basis of Cell- Substratum Adhesion 
Richard O. Hynes, Ph.D. 
211 Molecular Genetics of Intracellular Microorganisms 
Ralph R. Isberg, Ph.D. 
215 Genetic Approaches to the Control of Mycobacterial Disease 
William R. Jacobs, Jr., Ph.D. 
21 7 Molecular Studies of Voltage-Sensitive Potassium Channels 
Lily Y. Jan, Ph.D. 
219 Neural Development in Drosophila 
Yuh Nungjan, Ph.D. 
221 The Discrimination of Infectious Non-Self from Noninfectious Self 
Charles A. Janeway, Jr., M.D. 
225 Control of Cell Pattern in the Developing Nervous System 
Thomas M. Jessell, Ph.D. 
227 The Lactose Permease q/" Escherichia coli: A Paradigm for Membrane 
Transport Proteins 
H. Ronald Kaback, M.D. 
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