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Photographs showing the telomerase activity of three head and neck cancer cell lines by cisplatin and 5-fluorouracil (5-FU) exposure. Telomerase activity was observed by telomerase assay in PNUH-12 (A) and SNU-899 (B) cell lines. The telomerase activity decreased in a concentration-dependent manner after cisplatin exposure, while the change in telomerase activity was insignificant after 5-FU exposure.
