Contents. List of Contributors. Preface (S.S. Rothman). The Energetics of Bacterial Protein Translocation (R. Arkowitz). Transport of Pertussis Toxin Across Bacterial and Eukaryotic Membranes (D.L. Burns). Transport of Protein-Nucleic Acid Complexes Within and Between Plant Cells (V. Citovsky and P. Zambryski). Selective Degradation of Cytosolic Proteins by Direct Transport into Lysosomes (J.F. Dice). The Conformation and Path of Nascent Proteins in Ribosomes (B. Hardesty, A. Yonath, G. Kramer, O.W. Odom, M. Eisenstein, F. Feranceschi, and W. Kudlicki). Protein Import into Mitochondria (M. Horst and N.G. Kronidou). Selective Secretion by Lysosomes (L. Isenman). Colicin Transport (C.J. Lazdunski). The Mechanism of Diphtheria Toxin Translocation Across Membranes (E. London). Protein Translocation into Chloroplasts (M. Pilon, T. America, R. van't Hof, B. de Kruijff, and P. Weisbeek). Internalization of Pseudomonas Exotoxin A Utilizes the a2Macroglobulin Receptor/Low Density Lipoprotein Receptor Related Protein (R.E. Morris and C.B. Saelinger). Index.