In the fear conditioning test, YTHDF2 reexpression in DF2‐CKO mice almost normalized contextual memory to control levels both 1 and 24 h after training, with no effect on auditory fear memory (Figure 3D–H) or the motor activity and anxiety level in open field test (Figure S7B,C, Supporting Information) and light–dark box test (Figure S7D,E, Supporting Information). This evidence concerns the gene YTHDF2 and Anxiety.