No effect of leptin on in vitro growth of bone marrow cells from healthy and leukemic fa/fa rats.

Bone marrow cells from healthy fa/fa rats (A) and leukemicfa/fa rats (B) were injected with either leptin (10 ng/mL), anti–OB-R (10 μg/mL), or cyclophosphamide (Cyclo; 30 μg/mL). The asterisk denotes significantly lower values compared with control cells (no compound added). Values represent means + SEM; n = 8.