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Total progenitor cells in dispersed (○) or multicentric (•) 7-day blast colonies stimulated to develop by 100 ng of SCF alone or in combination with 50 ng of TPO, grouped according to whether the colonies did or did not contain megakaryocyte progenitor cells (MEG-CFC). Within each panel, total progenitor cells are grouped according to whether M-CSF was used as a stimulus in the secondary cultures (Right columns) or was not (Left columns).
