title: Comparative studies for the classification of the HeLa virus: occurrence, fine structure and immunoelectron microscopy.
mesh_terms: D000818:Animals; D000956:Antigens, Viral; D000882:Haplorhini; D006367:HeLa Cells / Q000382:microbiology*; D006801:Humans; D008854:Microscopy, Electron; D009858:Oncogenic Viruses / Q000276:immunology / Q000648:ultrastructure*
chemical_list: D000956:Antigens, Viral