MUC13 and infection: The fluorescent signal from MUC13 antibody staining clearly demonstrates the effect of atovaquone upon parasite growth, as P. berghei parasites treated with atovaquone very early in the P. berghei lifecycle (2 hpi, when atovaquone is most effective26) demonstrate a marked decrease in size (Fig. 4d) and infection rate when compared with later or no drug treatment.