Fig. 2From: Development of a rule-based automatic five-sleep-stage scoring method for ratsChanges of paw withdrawal thresholds in bilateral hindlimbs in the groups receiving pH 7.2 saline or pH 4.0 saline at day 2 (D2, baseline) and day 23 (2 weeks after the 2nd injection). *p < 0.05 compared with D2; #p < 0.05 compared with the group of pH 7.2Back to article page