• The bundle of fibrils that constitutes the central core of a cilium or flagellum.
  • The axial thread of a chromosome.
  • One of the threads or strands in the central portion of the contractile stalk of <em>Vorticellidæ.</em>
  • A bundle of nine <xref>microtubules</xref> forming the internal scaffolding of a <xref>cilium</xref>, with two extra central microtubules connecting the others if the cilium is <xref>motile</xref>
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