Cleavage-Site Motifs in Protein Targeting Sequences, G. von Heijne. Complications of RNA Heterogeneity for the Engineering of Virus Vaccines and Antiviral Agents, E. Domingo, J.J. Holland. The Quaternary Structures of SV40 Large T-Antigen and Tumor Suppressor p53, J.E. Stenger, et al. Assembly of Antibodies and Mutagenized Variants in Transgenic Plants and Plant Cell Cultures, A. Haitt, et al. Maize Endosperm Tissue as an Endoreduplication System, R.V. Kowles, et al. Study of Chlorate-Resistant Mutants of Arabidopsis, N.M. Crawford. Approaches and Progress in the Molecular Cloning of Plant Disease Resistance Genes, J.L. Bennetzen, J.D.G. Jones. Is GRP78 a Sensor of Cellular Secretory Activity? T. Leustek. The Molecular Biology of Pathogenesis in Ustilago Maydis, B.J. Saville, S.A. Leong. Molecular Design of Oligomeric Channel Proteins, A. Grove, et al. 5 additional articles. Index.