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Expression of pro-inflammatory cytokines in the heart (n = 5 in each group). A. Nicotine treatment significantly deceased the expression of IL-1, IL-6 and TNF-α compared with the myocarditis group on day 7. B. On day 14, no significant differences were found in the level of pro-inflammatory cytokines among the nicotine group, myocarditis group and methyllycaconitine group. &P < 0.05 versus the myocarditis group and #P < 0.05 versus the methyllycaconitine group.
