BM-MSCs express chemokine receptors. (A) RT-PCR expression of chemokine receptor mRNA in BM-MSCs. Human activated peripheral blood mononuclear cells (PBMCs) or splenocytes were used as positive controls (Ctrl). (B) Surface expression of CCR1, CCR7, CXCR6, CX3CR1, and CXCR4 on BM-MSCs detected by flow cytometry. A representative experiment of 5 is shown. The mean ± SD percentage of positive cells is indicated (n = 5). Open curves refer to control antibody signal; shaded curves refer to specific antibody signal.