Relationship of B-lymphoid/myeloid potential with timing of proliferation. Shown on the vertical axis is the percent clones with both B-lymphoid and myeloid potential over the total clones analyzed at each time point. Raw numbers of bipotent clones over total clones analyzed are shown above each bar. Data are compiled from a total of 2,112 CD34⁺CD38⁻ cells plated as single cells per well onto primary S17 culture and analyzed by FACS and switch culture.