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Chou-Talalay method Fa-CI plot of DOX/PTX and chloroquine (A), mefloquine (B) and artesunate (C). CI was plotted on y-axis as a function of effect level (Fa) on the x-axis to assess drug synergism. CI < 1, CI = 1 and CI > 1 indicate synergism, additivity, and antagonism, respectively.
