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Msp2 (P44) is presented on the A. phagocytophilum outer membrane. A. phagocytophilum-infected HL-60 cells were fixed and screened with a Msp2 (P44)-specific MAb followed by goat anti-mouse IgG conjugated to 6-nm gold particles and examined by electron microscopy. Morulae harboring DC (A) and RC (B) organisms are presented. Scale bars, 0.5 μm.
