highly significantP = 0.0095
M 4 R KO mice displayed a highly significant decrease (F 1,26 = 7.846, P = 0.0095) in mean duration per contact compared to wild-type mice (Figure 3C ), and M 4 R KO mice also traveled significantly longer than wild-type mice (F 1,26 = 6.445, P = 0.0175; Figure 3D ).