Expression (RT-PCR) of c-MET and β-actin (β-act; used as a positive control) mRNA in 10⁴ BM cells (lane 1), 10⁶ PBMC (lane 2), and in 10⁴ FACS STAR sorted CD34⁺ cells from BM (lane 3), immature B cells isolated from BM (CD19⁺CD20⁻, lane 4), mature B cells from BM (CD19⁺CD20⁺, lane 5), and B cells isolated from umbilical cord (CD19⁺, lane 6), PB B lymphocytes, either unstimulated (lane 7), stimulated with PMA (lane 8), ConA (lane 9), HGF/SF (lane 10), or infected with EBV (lane 11). Lane 12 is the water control for the PCR.