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Drug 7a and benznidazole effects on parasite invasion of mammalian cells. Parasites were plated on LLC-MK2 cells with compound 7a or benznidazole for 2 h. Noninvading parasites were washed away, and after 4 h, cells were stained with Giemsa. The number of infected cells was determined by direct analysis under a light microscope. *, P < 0.05.
