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.