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The expression levels of mRNA encoding P2Y1, P2Y2, and P2Y11 receptors in OSCC cell lines normalized to those of the reference genes, TUBA6 and RPS13, as analyzed by qPCR. A highly P2Y2 receptor-expressing MDA-MB-231 cell line was used as a technical positive control. Data are presented as mean ± SEM of three independent experiments, * p < 0.05, ** p < 0.01, *** p < 0.001, **** p < 0.0001.
