Answer: a, c, e A particularly important group of novel chemotactic cytokines has been elucidated over the last decade. Twelve are known and are listed below. C-X-C Chemokines Connective Tissue Activating Protein III b-Thromboglobulin Growth Related Oncogene-a Growth Related Oncogene-b Related Oncogene-g Interleukin-8 Epithelial Neutrophil Activating Protein Granulocyte Chemotactic Protein-2 Platelet Factor-4 g-Interferon-inducible Protein Monokine-induced by g-Interferon Each has unique biologic functions. There appear to be important in vivo cytokine networks involving these molecules which regulate chemotaxis, and other fundamental aspects of inflammation