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Response of Kirby and Wallangra isolates of H. contortus to thiabendazole in larval development assays. Each data point represents mean ± SE, n = 3 separate assay wells. Where SEs are not visible, they are smaller than the dimensions of the data symbols. Arrows indicate the drug concentrations that were used subsequently to partition the Wallangra isolate into sub-populations with different levels of drug resistance.
