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Statistical analysis
Unless stated otherwise, all the experiments were performed at least three times. The experimental data are expressed as mean ¡À standard deviation (SD). Statistical analysis was performed by Student¡¯s t-test with SPSS 16.0 software. Statistical significance was accepted for probability (P) < 0.05.

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Please describe better the statistical analysis. Why did you use the t-test?  Were the data normally distributed? How did you test normality?
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