Effects of Ros, BTTA, MK801 on pain response in acute pain models of rats. A. Effects of Ros, BTTA, MK801 on licking time in acute pain models of rats; B. Effects of Ros, BTTA, MK801 on frequency of biting in acute pain models of rats. Note: compared with the normal group, *means P < 0.05, **means P < 0.01, ***means P < 0.001; compared with DMSO, #means P < 0.05.