Fig. 4.
Colony-forming activity of chCLL-1/GM-CSF. Various concentrations of recombinant human GM-CSF, chCLL-1/GM-CSF, or chCLL-1 were cultured with 7.5 × 104 bone marrow MNC in triplicate in semisolid medium for 14 to 16 days at 37°C until colonies containing more than 30 cells formed.