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Expression of CXCL12 and CXCR4 in colon cancer cell lines. a Detection of CXCL12 and CXCR4 mRNA in colon cancer cells. PCR products stained with ethidium bromide were subjected to 1.5% agarose gel electrophoresis. b The protein expression of CXCL12 and CXCR4 in colon cancer cell lines was confirmed by Western blotting analysis. β-Actin served on a loading control
