(A) c-MET/HGF receptor expression on cell surface of BM stromal cells. Stromal cells were stained with anti–c-MET MoAb (DO-24). (B) RT-PCR analysis of c-MET gene expression. Lane 1, size marker; lane 2, BM stromal cells; lane 3, HL60 (promyelocytic leukemia cells), negative control; lane 4, Hep G2 (hepatocarcinoma cells), positive control. To clarify cDNA quality, PCR products of the β-actin gene are presented below each lane.