Effect of OSM on the hematopoietic supportive ability of stromal cell lines.

(A) MS-5 marrow line (negative control); (B) AFT024 fetal liver line; (C) 2018 fetal liver line; (D) BFC012 fetal liver line. Bone marrow lin⁻ cells were seeded at limiting dilution onto the stromal feeders, treated with OSM (○) or not (●). CAFC frequencies (determined at 37% negative wells) were measured at week 5. Data shown are the means of 4 experiments.