Parasite viability time-course in response to various concentrations of drugs.

A. P. falciparum viability time-course profiles for atovaquone, pyrimethamine, and artemisinin at concentrations corresponding to 1×, 3×, 10×, and 100× their respective IC50. Error bars are SEM of at least 4 independent experiments. B. Values represented in panel A. No PRR or 99.9% PCT could be calculated for the 1× IC50 conditions.