CONTENTS Preface / Alan S. Perelson ; Stuart A. Kauffman ... xi Rugged Landscapes and Evolution ... 1 Optimization on Rugged Landscapes / Richard Palmer ... 3 A Spin-Glass Model of Evolution / C. Amitrano ; L. Peliti ; M. Saber ... 27 What Can Physics Do For Biology? / D. L. Stein ... 39 Optimization of RNA Structure and Propterties / P. Schuster ... 47 Somatic Evolution of Antibody Variable-Region Genes & Maturation of the Immune Response ... 73 Affinity Maturation: A Retrospective View / Herman N. Eisen ... 75 Maturation through Hypermutation and Selection / C. Berek ; M. Apel ... 83 Affinity Maturation on Rugged Landscapes / Catherine Macken ; Alan S. Perelson ... 93 Maturation of the Humoral Immune Response: A Neo-Darwinian Process? / Tim Manser ... 119 Molecular Evolution on Rugged Landscapes, SFI Studies in the Sciences of Complexity, vol. IX, Eds. A. Perelson and S. Kauffman, Addison-Wesley, 1991 ... xvii The NK Model of Rugged Fitness Landscapes and Its Application to Maturation of the Immune Response / Stuart A. Kauffman ; Edward D. Weinberger ... 135 Use of Antibodies as Molecular Mimics to Probe Inter-molecular Interaction Landscapes / William V. Williams ; Thomas Kieber-Emmons ; Davi ... 177 Affinity Maturation and Learning in Immune Networks / G e ´ rard Weisbuch ; Alan S. Perelson ... 189 Auto-Anti-Idiotype and Antigen as Selective Factors Driv-ing B-Cell Affinity Maturation in the Immune System / Gregory W. Siskind ... 207 Somatic Mutation and the Antibody Repertoire: A Com-putational Model of Shape Space / Richard G. Weinand ... 215 Applied Molecular Evolution ... 237 Evolution of Proteins from Random Sequences: A Model for the Protein Sequence Space and an Experimental Ap-proach / Wlodek Mandecki ... 239 Studies in the Evolution of Biological Activity from Ran-dom Sequences / Marshall S. Z. Horwitz ; Dipak K. Dube ; Lawrence ... 255 The Catalytic Potential of RNA / Debra L. Robertson ; Gerald F. Joyce ... 265 Origin of Life Models ... 279 Dynamics of Autocatalyfcic Reaction Networks / P. Schuster ... 281 Index