Western blot analysis of the hippocampus 3 weeks after infection showed that rAAV‐hSyn‐shCTNNA2‐P2A‐mCherry‐WPREs virus, which carried a short hairpin RNA of ctnna2, reduced α‐N‐catenin expression in the hippocampus of mice (Figure 3B). This evidence concerns the gene CTNNA2 and infection.