basal body

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  1. (in prokaryotes) a structure that apparently attaches the flagellum (def. 1) to the cell envelope. The proximal end of the flagellum, the hook, appears curved and thickened and leads into the basal body, which consists of parallel ring-shaped structures, arranged around a rod-shaped core. The rings of the basal body make contact with the layers of the cell envelope.
  2. (in eukaryotes) a structure at the base of a cilium consisting of spherical granules or short rods arranged in rows below the cell surface. Electron microscopically they are cylindrical bodies, 300 — 500 nm long and 120 — 150 nm in diameter, open at one or both ends. They consist of nine sets of triplet microtubules, each triplet containing one complete microtubule fused to two incomplete microtubules.

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physa (invertebrate zoology)
kinetoplast (cell and molecular biology)