Fig. 5. Cyclooxygenase (COX)-1 and COX-2 expressions in dorsal root ganglia. (  A ) Western blots for COX-1 (  left ) and COX-2 (  right ) protein extracted from dorsal root ganglia after the injection of carrageenan. COX-1, COX-2, and actin were immunodetected as shown in representative blots. (  B ) Optical density analyses of COX-1:actin and COX-2:actin ratios. Data are presented as mean ± SD from six rats at each time point.