title: Flagellar necklaces: freeze-etch observations.
mesh_terms: D000818:Animals; D005407:Flagella; D005613:Freeze Etching; D008297:Male; D008854:Microscopy, Electron; D008928:Mitochondria; D009835:Oligochaeta; D013094:Spermatozoa / Q000166:cytology*