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The inhibitory effects of water solution of Houttuynia cordata poultice ethanol extract (wHCP) pretreatment on IL-8 (a) and CCL20 (b) productions in oral keratinocytes stimulated with P. gingivalis for 24 h. Significant differences versus no pretreatment control group at ∗ P < 0.05 and ∗∗ P < 0.01 using Student's t-test.
