Figure 1: The cloned ABCG2-specific aptamer ABCG2/A12 clearly stained the surface of ABCG2-expressing BHK/ABCG2 cells. A. ABCG2/A12 cannot stain the parental BHK cells: left section, BHK cells were stained with DAPI; middle section, with FITC-labeled ABCG2/A12; right section, merge of the previous two sections. B. ABCG2/A12 clearly stained the surface of ABCG2-expressing BHK/ABCG2 cells. C. FACS profiles of FITC-labeled ABCG2/A12-stained BHK cells. D. FACS profiles of FITC-labeled ABCG2/ A12-stained BHK/ABCG2 cells.