title: Ultrastructure of flagellated lambda symbionts in Paramecium aurelia.
mesh_terms: D000818:Animals; D005407:Flagella; D006652:Histological Techniques; D008854:Microscopy, Electron; D008858:Microscopy, Phase-Contrast; D010247:Paramecium / Q000166:cytology*; D012287:Rickettsiaceae / Q000166:cytology*