Fig. 5. Cyclooxygenase 1 (COX-1) immunoreactivity in the spinal cord of 2-week-old animals after surgery. There was no difference in COX-1 positive cells between left (surgery) and right spinal cords at any time (n = 6). Ten to 15 spinal cord slices were counted from each animal and were averaged to give the number of positive cells per slice for each animal.