Dr. J. J. Marr has held positions in academic medicine and biochemistry; as Director of Divisions of Infectious Diseases; Vice Chairman, Department of Medicine; and Professor of Medicine, Biochemistry and Microbiology at Washington University, St. Louis University and the University of Colorado. Subsequently, he was Senior Vice Presidnt for Drug Discovery at Searle Pharmaceuticals, acted as a consultant to the National Institutes of Health and the World Health Organization, and now holds the position of Vice President for Research and Development/Chief Scientific Officer, Ribozyme Pharmaceuticals, Inc. Dr. M. Muller has held academic positions at the Medical University of Budapest, the Rockefeller University and the Carlsberg Laboratories in Copenhagen. He is a past President of the Society of Protozoologists, Founding Editor of Molecular and Biochemical Parasitology, and now heads the Rockefeller University Laboratory of Biochemical Parasitology. He has also acted as a consultant to the National Institutes of Health, the World Health Organization and to the Center for Disease Control.

• E. Ullu and T. Nilsen, Molecular Biology of Protozoan and Helminth Parasites.F.R. Opperdoes, Carbohydrate and Energy Metabolism in Aerobic Protozoa.G.H. Coombs and M. Muller, Energy Metabolism in Anaerobic Protozoa.R. Komuniecki and B.G. Harris, Carbohydrate and Energy Metabolism in Helminths.M.J. North and B.C. Lockwood, Amino Acid and Protein Metabolism.R.L. Berens, E.C. Krug, and J.J. Marr, Purine and Pyrimidine Metabolism.C.J. Bacchi and N. Yarlett, Polyamine Metabolism.W.R. Fish, Lipid and Membrane Metabolism of the Malaria Parasite and the African Trypanosome.R. Docampo, Antioxidant Mechanisms.J.W. Tracy and E.A. Vande Waa, Xenobiotic Metabolism.S.J. Turco, Surface Constituents of Kinetoplastid Parasites.D.P. Thompson and T.G. Geary, The Structure and Function of Helminth Surfaces.M. Parsons, Protozoan Cell Organelles.R.E. Davis and A.O.W. Stretton, Neurotransmitters of Helminths.H.R. Gamble, R.H. Fetterer, and J.F. Urban, Reproduction and Development of Helminths.J.F. Dubremetz and J.H. McKerrow, Invasion Mechanisms.J.J. Marr and B. Ullman, Concepts of Chemotherapy.Subject Index.

Dr. J. J. Marr has held positions in academic medicine and biochemistry; as Director of Divisions of Infectious Diseases; Vice Chairman, Department of Medicine; and Professor of Medicine, Biochemistry and Microbiology at Washington University, St. Louis University and the University of Colorado. Subsequently, he was Senior Vice Presidnt for Drug Discovery at Searle Pharmaceuticals, acted as a consultant to the National Institutes of Health and the World Health Organization, and now holds the position of Vice President for Research and Development/Chief Scientific Officer, Ribozyme Pharmaceuticals, Inc. Dr. M. Muller has held academic positions at the Medical University of Budapest, the Rockefeller University and the Carlsberg Laboratories in Copenhagen. He is a past President of the Society of Protozoologists, Founding Editor of Molecular and Biochemical Parasitology, and now heads the Rockefeller University Laboratory of Biochemical Parasitology. He has also acted as a consultant to the National Institutes of Health, the World Health Organization and to the Center for Disease Control.

• E. Ullu and T. Nilsen, Molecular Biology of Protozoan and Helminth Parasites.F.R. Opperdoes, Carbohydrate and Energy Metabolism in Aerobic Protozoa.G.H. Coombs and M. Muller, Energy Metabolism in Anaerobic Protozoa.R. Komuniecki and B.G. Harris, Carbohydrate and Energy Metabolism in Helminths.M.J. North and B.C. Lockwood, Amino Acid and Protein Metabolism.R.L. Berens, E.C. Krug, and J.J. Marr, Purine and Pyrimidine Metabolism.C.J. Bacchi and N. Yarlett, Polyamine Metabolism.W.R. Fish, Lipid and Membrane Metabolism of the Malaria Parasite and the African Trypanosome.R. Docampo, Antioxidant Mechanisms.J.W. Tracy and E.A. Vande Waa, Xenobiotic Metabolism.S.J. Turco, Surface Constituents of Kinetoplastid Parasites.D.P. Thompson and T.G. Geary, The Structure and Function of Helminth Surfaces.M. Parsons, Protozoan Cell Organelles.R.E. Davis and A.O.W. Stretton, Neurotransmitters of Helminths.H.R. Gamble, R.H. Fetterer, and J.F. Urban, Reproduction and Development of Helminths.J.F. Dubremetz and J.H. McKerrow, Invasion Mechanisms.J.J. Marr and B. Ullman, Concepts of Chemotherapy.Subject Index.