title: Rotation and first reversion in the Octopus embryo--a case of gradual reversal of ciliary beat.
mesh_terms: D000818:Animals; D002923:Cilia / Q000502:physiology*; D004625:Embryo, Nonmammalian / Q000502:physiology*; D005321:Extraembryonic Membranes / Q000502:physiology; D008974:Mollusca / Q000196:embryology*; D012399:Rotation