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The relative expression levels of MHC-I and MHC-II were calculated using the 2-ΔΔCt method. The error bars represent standard errors of the mean. Statistically significant differences between the mean gene expression levels in different organs were determined by one-way ANOVA (P < 0.05). *P < 0.05, **P < 0.01 or ***P < 0.001 indicate the level of statistical significance of differences between different groups.
