title: Electron microscopy of antigen precipitates extracted from gel diffusion plates.
mesh_terms: D000941:Antigens; D005779:Immunodiffusion; D066298:In Vitro Techniques; D008854:Microscopy, Electron; D010942:Plant Viruses / Q000276:immunology*; D011120:Polyomavirus / Q000276:immunology*
chemical_list: D000941:Antigens