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Anthelmintic activity of isolated procyanidin clusters against C. elegans. Untreated C. elegans in test medium containing 1% DMSO served as negative control (NC), levamisole-HCl (40 mM) served as positive control. ** p < 0.01, *** p < 0.001 compared to NC. Brackets indicate significant differences in the activity among the OPC clusters DP3 to DP10 (* p < 0.05, ** p < 0.01, *** p < 0.001).
