title: Ultrastructure of Actinomyces viscosus and Actinomyces naeslundii.
mesh_terms: D000190:Actinomyces / Q000166:cytology*; D002473:Cell Wall; D003593:Cytoplasm; D005613:Freeze Etching; D008722:Methods; D008854:Microscopy, Electron; D013194:Staining and Labeling