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Viability of Hela and Siha cells at different time after transfection determined by MTT assay. Viabilities of Hela and Siha cells in transfection group were 91.47%, 86.74%, 78.92%, 48.98% and 90.45%, 84.16%, 71.09%, 60.47% at 24, 48, 72 and 96 h, respectively. (n = 3, *P < 0.05, **P < 0.01, compared with control group).
