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In vitro cytokine production following stimulation with low molecular weight urokinase plasminogen activator for 48 hours. (a) IL-6 (n = 10), (b) tumour necrosis factor alpha (TNF-α) (n = 6), and (c) IL-1β (n = 4). Levels of cytokines are presented as the mean ± SEM (pg/ml). Significant difference in the groups is indicated; n.s., not significant.
