The pair of central tubules rotates during ciliary beat in Paramecium.
D000818:Animals; D002923:Cilia / Q000502:physiology* / Q000648:ultrastructure; D008124:Locomotion; D008870:Microtubules / Q000502:physiology*; D010247:Paramecium / Q000502:physiology* / Q000648:ultrastructure