1. Yeast Prions: Evolution of the Prion Concept 2. The Genetic Control of the Formation and Propagation of the [AS/*] Prion of Yeast 3. A Short History of Small 5: A Prion of the Fungus Podospora anserina 4. Prion-Prion Interactions 5. Prion Stability 6. Prion and Nonprion Amyloids: A Comparison Inspired by Yeast Sup35 Protein. 7. Chaperone Effects on Prion and Nonprion Aggregates. 8. Biological Roles of Prion Domains. 9. Preformed and Cell Structures and cell Heredity. 10. Centriole Inheritance