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Actin localizes to the cytostome neck in IRBC. Representative immunoelectron micrographs of P. falciparum trophozoites probed with anti-T. gondii actin antibody. (A and B) Micrographs showing actin labeled with 12-nm gold particles (arrowheads) localized to electron-dense collars at the cytostome neck (dashed box). (C) Actin (arrowheads) associated with a hemoglobin-containing compartment in the parasite cytosol (dashed box). Scale bars, 250 nm.
