chapter 1 RNAi and Cosuppression: Double-Stranded RNA as an Agent of Sequence-Specific Genetic Silencing in Animals and Plants -- chapter 2 The Double-Stranded RNA-Activated Protein Kinase PKR -- chapter 3 The Double-Stranded RNA Viruses of Saccharomyces Cerevisiae -- chapter 4 The Double-Stranded RNA Viruses of Ustilago Maydis and Their Killer Toxins -- chapter 5 Molecular Basis of Symptom Expression by the Cryphonectria Hypovirus -- chapter 6 Engineering Hypoviruses for Fundamental and Practical Applications -- chapter 7 Viruses of the Dutch Elm Disease Fungi -- chapter 8 Double-Stranded RNA Elements Modulating Virulence in Rhizoctonia Solani -- chapter 9 Molecular Genetics of the Viruses Infecting the Plant Pathogenic Fungus Helminthosporium Victoriae -- chapter 10 Unraveling the Viral Complex Associated with La France Disease of the Cultivated Mushroom, Agaricus bisporus -- chapter 11 Large dsRNA Genetic Elements in Plants.