Self-renewal capacity of Pax5^−/− pre-B I cells in bone marrow.

CFSE-labeled Pax5^−/− pre-B I cells were transplanted into RAG2^−/− host, and the fluorescence intensity of the bone marrow–homed cells was determined after 3 days (red) and 4 days (brown). Fluorescence intensity after 1-day proliferation (black) in vitro is shown for comparison.