Firefly luciferase plasmids of target gene (CXCL12). (a) During the co-transfection process, experimental grouping has been completed, including miR-1273h-5p(negative con)-CXCL12(negative con), miR-1273h-5p(negative con)-CXCL12(wide type 1 or 2), miR-1273h-5p(negative con)-CXCL12(mutant 1 or 2), miR-1273h-5p(mimic)-CXCL12(negative con), miR-1273h-5p(mimic)-CXCL12(wide type 1 or 2), and miR-1273h-5p(mimic)-CXCL12(mutant 1 or 2). (b) Firefly luciferase negative control plasmids, which did not carry the gene sequence. (c) Base sequences of CXCL12 wild type 1 and mutation 1 and assembly sites with plasmid vectors. (d) Base sequences of CXCL12 wild type 2 and mutation 2 and assembly sites with plasmid vectors. The sequence of junction bases with miRNA is bold.