Fig. 6.
B and NK lineages diverge and become independently regulated by IL-7 or IL-15.
The Lin− c-kitLo fraction of bone marrow cells was placed in primary cultures containing SCF, FL, and IL-7 for 5 days. Harvested cells were then washed and cultured for an additional 5 days with either IL-7 alone or IL-15 alone. The recovered cells were then analyzed by flow cytometry as shown.