Figure 4From: Anxiety- and depressive-like responses and c-fos activity in preproenkephalin knockout mice: Oversensitivity hypothesis of enkephalin deficit-induced posttraumatic stress disorderLight/dark avoidance test. Mean (± SEM) latency time prior to entering the dark chamber in WT-footshock (n = 7), ppENK-footshock (n = 7), WT-no footshock (n = 9), and ppENK-no footshock (n = 9) groups. n.s. indicates there is a non-significant (p > 0.05) when comparing the significant difference between wild type and ppENK groups.Back to article page