Downregulation of CXCR7 expression in SMMC-7721 cells by transfection with CXCR7shRNA. SMMC-7721 cells were stably transfected with CXCR7shRNA. CXCR7 expression was strongly suppressed by specific CXCR7shRNA. A. cellular RNA was harvested after G418 selection and CXCR7 mRNA was measured using RT-PCR. GAPDH was used as a loading control. B. after G418 selection, the protein expression levels of CXCR7 were measured by Western blot using anti-CXCR7 antibody and β-actin as a loading control. The experiment was repeated three times with similar results.