Unilineage megakaryocytic proliferation and differentiation of purified hematopoietic progenitors in serum-free liquid culture - Guerriero, R; Testa, U; Gabbianelli, M; Mattia, G; Montesoro, E; Macioce, G; Pace, A; Ziegler, B; Hassan, HJ; Peschle, C (Blood, 1995)