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Bupi inhibits the viability of CAL-27 cells. (A) Chemical structure of Bupi. (B) Cell viability of CAL-27 cells is examined using a CCK-8 assay. Cell viability (%) = (OD 490 of the samples/OD 490 of the control) ×100%. *P<0.05, **P<0.01 vs. 0 h. Data are presented as mean ± SD in triplicate. CCK-8, cell counting kit-8; OD, optical density.
