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Concentration-dependent effect of atovaquone-proguanil combination on parasite respiration. The rate of O2 consumption was measured in the presence of various concentrations of atovaquone either alone (○) or in combination with the two highest concentrations of proguanil (2.3 × 10−6 M [■] and 2.3 × 10−5 M [□]). The error bars indicate standard deviations.
