NPFFR2 and Anxiety: Bonferroni’s multiple comparison test reveals that SPS exposure increased the anxiety-like behaviors tested by EPM in WT mice (open arms, p = 0.0278; close arms, p = 0.0106; open arm entries, p = 0.0002), but not in NPFFR2 KO mice (open arms, p = 0.3149; close arms, p = 0.1514; open arm entries, p = 0.4198).