Morphology of CD34⁺Lin⁻ cells from unicellular, unilineage erythroid cultures. (A) A freshly seeded single cell is shown that had generated 4 siblings after approximately 50 hours of culture (B) (original magnification for [A] and [B] was 100-fold). One of the siblings was transferred to a separate well containing unilineage erythroid culture medium and allowed to further differentiate/proliferate (C) (a representative May-Grünwald-Giemsa–stained cytospin preparation is shown; original magnification × 1,000).