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Melatonin inhibited the levels of pro-inflammatory cytokines in the pulp of AP rats. A. Pro-inflammatory cytokines in the pulp at different time points of AP group. B. Melatonin inhibited the levels of pro-inflammatory cytokines at 1 d of the pulp. SHAM: results in the SHAM group; AP: results in the AP group at 1 d; AP+M: results in the AP+M group at 1 d; AP+E: results in the AP+M group at 1 d. **P<0.01 vs. SHAM; ##P<0.01 vs. AP; n=8.
