InhaltsangabeInvertebrate Humoral Factors: Cytokines as Mediators of Cell Survival.- Cytokines in Drosophila Hematopoiesis and Cellular Immunity.- Analogies Between Drosophila and Mammalian TRAF Pathways.- Regulation of BMP and Activin Signaling in Drosophila.- The Chemokine Networks in Sponges: Potential Roles in Morphogenesis, Immunity and Stem Cell Formation.- Functional Convergence of Invertebrate and Vertebrate Cytokine-Like Molecules Based on a Similar Lectin-Like Activity.- Tunicate Cytokine-like Molecules and Their Involvement in Host Defense Responses.