Detection of peroxidase-antiperoxidase soluble complexes (PAP) bound to the surface of herpes simplex virus-infected cells has been used to demonstrate virusinduced Fc receptors and to study their distribution. The PAP method is more sensitive than hemadsorption with immunoglobulin-coated sheep red blood cells, and can be used to study localization by light and electron microscopy. Our results indicate that capping takes place after the receptor is engaged by antigen-antibody complexes and that at least a portion of the bound ligand is internalized.

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