VII. Repair Models and Mechanisms.- 57. Repair Models and Mechanisms: Overview.- 58. List of Genes Affecting DNA Metabolism in Escherichia coli.- 59. Effect of Mutations in lig and polA on UV-Induced Strand Cutting in a uvrC Strain of Escherichia coli.- 60. Dependence Upon Growth Medium and the polA, polC, recA, recB, recC, and exrA Genes of Separate Branches of the uvr Gene-Dependent Excision-Repair Process in Escherichia coli K12 Cells.- 61. Near-UV Photoproduct(s) of L-Tryptophan: An Inhibitor of Medium-Dependent Repair of X-Ray-Induced Single-Strand Breaks in DNA Which Also Inhibits Replication-Gap Closure in Escherichia coli DNA.- 62. The Radiobiology of DNA Strand Breakage.- 63. Radiation-Induced Strand Breakage in DNA.- 64. DNA Repair in DNA-Polymerase-Deficient Mutants of Escherichia coli.- 65. Phleomycin-Induced DNA Lesions and Their Repair in Escherichia coli K12.- 66. Repair of Cross-Linked DNA in Escherichia coli.- 67. Recovery of the Priming Activity of DNA in X-Irradiated Escherichia coli.- VIII. Repair Processes in Diverse Systems.- 68. Repair Processes in Diverse Systems: Overview.- 69. Repair of Double-Strand Breaks in Micro coccus radiodurans.- 70. DNA Repair and Its Relation to Recombination-Deficient and Other Mutations in Bacillus subtilis.- 71. Repair of Ultraviolet Damage in Haemophilus influenzae DNA.- 72. Molecular Mechanisms for DNA Repair in the Blue-Green Algae.- 73. DNA Repair and the Genetic Control of Radiosensitivity in Yeast.- 74. Radiation-Sensitive Mutants of Yeast.- 75. X-Ray-Induced Dominant Lethality and Chromosome Breakage and Repair in a Radiosensitive Strain of Yeast.- 76. The Repair of Double-Strand Breaks in Chromosomal DNA of Yeast.- 77. The Fate of UV-Induced Pyrimidine Dimers in the Nuclear and Mitochondrial DNAs of Saccharomyces cerevisiae on Various Postirradiation Treatments and Its Influence on Survival and Cytoplasmic “Petite” Induction.- 78. Genetic Control of Radiation Sensitivity and DNA Repair in Neurospora.- 79. Enzymes of Neurospora crassa Which Attack UV-Irradiated DNA.- 80. Dictyostelium discoideum: A Valuable Eukaryotic System for Repair Studies.- 81. Absence of Pyrimidine Dimer Excision and Repair Replication in Chlamydomonas reinhardti.- 82. Absence of a Pyrimidine Dimer Repair Mechanism for Mitochondrial DNA in Mouse and Human Cells.- IX. Repair in Mammalian Cells.- 83. Repair in Mammalian Cells: Overview.- 84. Repair (or Recovery) Effects in Quiescent Chinese Hamster Cells: An Attempt at Classification.- 85. Excision-Repair in Primary Cultures of Mouse Embryo Cells and Its Decline in Progressive Passages and Established Cell Lines.- 86. Repair of Alkylated DNA in Mammalian Cells.- 87. Postreplication Repair-of DNA in UV-Irradiated Mammalian Cells.- 88. Synthesis by UV-Irradiated Human Cells of Normal-Sized DNA at Long Times After Irradiation.- 89. Effects of Caffeine on Postreplication Repair in Xeroderma Pigmentosum Cells.- 90. Inhibition of DNA Synthesis by Ultraviolet Light.- 91. Concerning Pyrimidine Dimers as “Blocks” to DNA Replication in Bacteria and Mammalian Cells.- 92. Postreplication Repair in Human Cells:. On the Presence of Gaps Opposite Dimers and Recombination.- 93. Thymine Dimer Excision by Extracts of Human Cells.- 94. Studies on DNA Repair in Mammalian Cells: An Endonuclease Which Recognizes Lesions in DNA.- 95. Formation and Rejoining of DNA Strand Breaks in X (?)-Irradiated Cells in Relation to the Structure of Mammalian Chromatin.- 96. CHO Cell Repair of Single-Strand and Double-Strand DNA Breaks Induced by ?- and ?-Radiations.- 97. TheRepair of DNA Double-Strand Breaks in Mammalian Cells and the Organization of the DNA in Their Chromosomes.- 98. Kinetics of the Single-Strand Repair Mechanism in Mammalian Cells.- 99. Damage-Repair Studies of the DNA from X-Irradiated Chinese Hamster Cells.- 100. Current Knowledge of the Formation and Repair of DNA Double-Strand Breaks.- 101. The Dependence of DNA Sedimentation on Centrifuge Speed.- X. Relationships Among Repair, Cancer, and Genetic Deficiency.- 102. Relationships Among Repair, Cancer, and Genetic Deficiency: Overview.- 103. Direct Evidence That Pyrimidine Dimers in DNA Result in Neoplastic Transformation.- 104. Genetic Complementation Analysis of Xeroderma Pigmentosum.- 105. Repair Deficiency and Genetic Complementarity of Fibroblast Cells in Culture from Six Xeroderma Pigmentosum Patients.- 106. Use of an Enzymatic Assay to Evaluate UV-Induced DNA Repair in Human and Embryonic Chick Fibroblasts and Multinucleate Heterokaryons Derived from Both.- 107. The Use of Human Adenovirus 2 in the Study of Xeroderma DNA-Repair Defect.- 108. Host-Cell Reactivation of Irradiated Human Adenovirus.- 109. Animal Viruses, Radiation, Repair Mechanisms, and Cancer.- 110. Excision-Repair of 4-Nitroquinoline-1-oxide Damage Responsible for Killing, Mutation, and Cancer.- 111. Response to Homozygous and Heterozygous Xeroderma Pigmentosum Cells to Several Chemical and Viral Carcinogens.- 112. Cytotoxic and Mutagenic Effects of Carcinogenic Aromatic Amides and Polycyclic Hydrocarbons and Ultraviolet Irradiation in Normally Repairing and Repair-Deficient (Xeroderma Pigmentosum) Diploid Human Skin Fibroblasts.- 113. Lack of Direct Correlation Among Repair, Oncogenesis, and Lethality in Cultured Synchronized Mouse Fibroblasts Treated withN-Methyl-N?-nitro-N-nitrosoguanidine.- 114. Repair of DNA Strand Breaks in Progeric Fibroblasts and Aging Human Diploid Cells.- 115. DNA Repair and Life Span of Mammals.- 116. Increased DNA Excision-Repair as Pathogenesis of a Human Leukemia.- 117. Radiosensitization of a Human Cell Line Lacking Repair Replication.- 118. A Repressible DNA-Repair System in Mouse Neuroblastoma Cells.- 119. DNA Repair and UV Resistance in Human Melanoma.- 120. Faulty DNA Repair Following Ultraviolet Irradiation in Fanconi’s Anemia.- Author Index (to Parts A and B).- Subject Index (to Parts A and B).