2.4 Statistical analyses
In Western-blot experiments, densitometric data were expressed as the
ratio to GAPDH protein. The density ratio of CD73 to GAPDH or that of
ECP1 to GAPDH obtained from all of the samples of rats in control group
was averaged, and that obtained from the sample of individual rats was
further divided by this average value to get the relative value. Data
are presented as means ± SE, and compared with paired t -test or
one-way ANOVA followed by Bonferroni correction when appropriate using
the SPSS 17.0 software (SPSS, Inc., IL, USA). Shaprio-Wilk test and
Kolmogorov-Smirnov test were run before parametric tests to make sure
that the data follow a normal distribution. Significance was set atp < 0.05.