Number of viable cells (A) and number of cells positive for immunostaining with CD66b (B) on days 5, 7, 10, and 14 of culture in the presence of the designated factors. Cultures were initiated with 2 × 10³ PB-derived CD34⁺IL-6R⁺ cells per dish. Shown are the numbers of cells on days (□) 5, () 7, (▨) 10, and (▪) 14.