The Mpl-Ligand or thrombopoietin or megakaryocyte growth and differentiative factor has both direct proliferative and differentiative activities on human megakaryocyte progenitors - Debili, N; Wendling, F; Katz, A; Guichard, J; Breton-Gorius, J; Hunt, P; Vainchenker, W (Blood, 1995)