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Action of sesquiterpene lactones (1–5) on IL-8 production in HUVEC-tert cells stimulated by LPS (100 ng/mL, left panel) or TNF-α (30 ng/mL, right panel). Effects of LPS and TNF-α were analyzed within the same experiment. Results of a representative experiment are shown (** indicates p < 0.01 as compared with the control condition).
