Subcellular localization of PfRh2a/b in 3D7 parasites by immunoelectron microscopy. (A-C) Cross-sections through merozoites. Scale bars are 200 nm in all panels. Immunoelectron microscopy with anti-PfRh2a/b antibodies showed labeling in the electron-dense rhoptry organelles of the parasite (A and C), with label evident in the neck of the rhoptry in some parasites (B).

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