Figure 1
From: Effects of mu- and kappa-2 opioid receptor agonists on pain and rearing behaviors
Illustrated is an animal that is at rest (A) and rearing (B) in the rearing assay testing device. An example of the trace recording is illustrated in panel C with the arrows denoting distinct rearing events. Animals (N = 12) tested on three consecutive days displayed a significant decrease (*P < 0.05) in the number of reaches (D), but not in the total rearing duration (E). The raw number of events or time (s) is denoted in the parentheses.