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Cell viability of KYSE150 and KYSE30 cells was assessed using MTT assay after treatment with 0, 2.5, 5, 10, 20, and 40 M UCB for 24 h. The data are presented as mean + SEM. Two-tailed Student’s t-tests were performed between the 0 M UCB group and other level groups in KYSE150 and KYSE30 cells. The results are denoted as ** for p < 0.01, *** for p < 0.001, and ### for p < 0.001. SEM stands for standard error of the mean

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