Statistical analysis
Data are presented as mean ±
standard error of the mean
(SEM).
All statistical analyses were performed using SPSS Statistics, version
19.0 (IBM Corp, Armonk, NY, USA). Analysis of variance and Student’s
t-test were used to assess differences between groups. Differences with
p<0.05 were regarded as statistically significant. All
experiments were performed independently at least twice with similar
results. Representative results are shown.