Chapter 1 Histocompatibility Responses in Freshwater Sponges: A Model for Studies of Cell-Cell Interactions in Natural Populations and Experimental Systems

Chapter 2 The Role of Mesohyl Cells in Sponge Allograft Rejections

Chapter 3 Sulfated Polysaccharide-Mediated Sponge Cell Aggregation: The Clue to Invertebrate Self/Nonself-Recognition?

Chapter 4 Historecognition and Immunocompetence in Selected Marine Invertebrates

Chapter 5 Speculations on the Relationships of Two Botryllus Allo-Recognition Reactions—Colony Specificity and Resorption—To Vertebrate Histocompatibility

Chapter 6 Molecular Approaches to Histocompatibility in Colonial Tunicates

Chapter 7 Evolution of MHC Genes and Functions: The Disease Connection

Chapter 8 Retreat Growth in the Ascidian Botryllus Schlosseri : A Consequence of Nonself Recognition

Chapter 9 Historecognition and Fine-Scale Spatial Genetic Structure in Sessile Benthic Invertebrates

Chapter 10 Recognition of Self or Nonself? Theoretical Implications and an Empirical Test

Chapter 11 Kin Recognition Using Innate Labels: A Central Role for Piggybacking?

Chapter 12 The Evolution of Allorecognition Specificity