Figure 3: The#1-F aptamer specifically recognizes EpCAMexpressing cancer cells. (a)Pancreatic (PANC-1), breast (MDAMB- 468 and SKBR-3), ovarian (Hey), prostate (DU145), and colon (HT29) cancer cell lines, as well as two immortalized epithelial (293T and HeLa) cell lines were stained with #1-Faptameror the anti-EpCAM antibody and the cell binding was determined by flow cytometry. (b) EpCAM-negative leukemia and lymphoma cell lines were examined by flow cytometry under the same condition.