Fig. 6. Effects of prostaglandin E2(PGE2) perfusion on [Ca2+]iin the dorsal horn of spinal cord slices from normal rats (A ) and carrageenan-treated rats with inflammation in the early phase (3 h;B ) and late phase (15 h;C ). N = 6 in each group. *P < 0.05 compared with post-PGE2perfusion on the contralateral side; †P < 0.05 compared with pre-PGE2perfusion on the referred side.