ZMYND8 and Anxiety: Rack7‐cKO mice displayed similar activity levels as the WT mice in the open field (2‐way ANOVA) (Figure S1c, Supporting Information), but the Rack7‐cKO mice crossed the center of the open field less than WT, especially in the first day (2‐way ANOVA, Day 1 p < 0.001, Day 2 and 3 p < 0.05), suggesting that Rack7‐cKO mice may have an anxiety‐related phenotype (Figure 1i).