Thrombopoietin directly and potently stimulates multilineage growth and progenitor cell expansion from primitive (CD34+ CD38-) human bone marrow progenitor cells: distinct and key interactions with the ligands for c-kit and flt 3, and inhibitory effects of TGF-beta and TNF-alpha - Ramsfiell, V; Borge, OJ; Cui, L (J Immunol, 1997)
et al.