Contents: Jaks and normal hematopoiesis -- Jak3-dependent pathways in hematopoiesis and SCID -- Stat activation by Src, Fes and Btk tyrosine kinases -- Stats and hematopoiesis --Stat signaling in leukemia: implications for pathogenesis and treatment -- The role of the Jak-Stat pathway in hematopoiesis and immune responses in Drosophila -- SOCS proteins in hematopoiesis