title: Do adult centrioles contain cartwheels and lie at right angles to each other?
abstract: Adult centrioles are said to lie at right angles and contain a cartwheel structure at the proximal end, but a critical review of the literature reveals no support for either of these claims. The evidence suggests that cartwheels are a feature of procentrioles not adult centrioles, and the orientation between adult centrioles has never been investigated with a convincing degree of accuracy - in the absence of firm data this should remain an open question.
mesh_terms: D000818:Animals; D002502:Centrioles / Q000648:ultrastructure*; D008854:Microscopy, Electron; D008938:Mitosis; D013045:Species Specificity