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Folate receptor (FR) expression in the 3 cell lines was detected by RT-qPCR (A) and the expression in the tumor tissues of the corresponding xenografts detected by western blot analysis (B) and immunohistochemical staining (C). The tumor tissues of Bel7402 and SW620 tumor xenografts expressed higher levels of FR than those of the A549 tumor xenografts, and the differences in the data were considered statistically significant (P<0.05).
