(A) RNA in situ hybridization with a probe against Nxph4 only detected Nxph4 signal in WT but not KO mice. Scale bars: 2 mm. (B) RT-qPCR from cerebellar samples with specific primers for Nxph4 (n = 3). (C, D) Weight of male mice at 9 months of age and female mice at 13 months of age (male n = 14–18, female n = 10). (E, F) Total distance traveled in the open field assay (male n = 12–14, female n = 16–17). (G, H) Righting reflex assay was performed on postnatal day 10 mice. Y-axis shows the time that mice spent to reflex themselves after being placed on their back (male n = 11–28, female n = 11–29). Data are presented as mean ± SEM. *, p<0.05; **, p<0.01; n.s., not significant; by one-way ANOVA.