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Immunogold localization of P. gingivalis RCP. Thin-section electron photomicrographs of P. gingivalis cells. P. gingivalis cells were incubated with preimmune rabbit serum (A) or anti-RCP serum (B), followed by anti-rabbit IgG conjugated to 10-nm gold particles. Note that some of the immunogold-labeled colloid was observed in both the cytoplasm and the surface-associated compartments of P. gingivalis cells. Bars, 0.25 μm.
