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A) The log transformed force of both hind limbs before morphine administration for the control group (n = 41), and both affected and unaffected hind limbs of the affected group (n = 75) are displayed as boxplots, showing mean, quartiles with 5–95 percentile error bars (***p<0.001). B) The threshold force of both hind limbs after morphine administration for the control group (n = 41), and both affected and unaffected hind limbs of the affected group (n = 75) (**p<0.01).
