SRF and Anxiety: The observed social behavior in SRF KO mice is highly specific and not confounded by other factors such as anxiety (Fig. S2a; p = 0.9588), disrupted activity (Fig. S2b; p = 0.18745, c; p = 0.3101), inability to follow conspecifics and thus respond to social cues (Fig. S2d; p = 0.4309) or impaired ability to locate stimuli (Fig. S2e; p = 0.4619).