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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 10 ng of IL-5, grouped according to whether the colonies did or did not contain eosinophil progenitor cells (EO-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).
