CD34⁺ KG1 and HSCs express fMLP receptors. RT-PCR analysis of fMLP receptor expression in CD34⁺ KG1 cells and highly purified G-CSF–mobilized peripheral blood CD34⁺ HSCs (PB HSC) from a representative donor. RT-PCR was performed in the presence of specific primers for FPR, FPRL1, and FPRL2. PCR amplification of 50 ng human genomic DNA was added as a positive control.