has part has part has_part radial spoke motile cilium inner dynein arm outer dynein arm axonemal central pair axonemal doublet microtubule 9+2 motile cilium motile 9+2 cilium cellular_component A motile cilium where the axoneme has a ring of nine outer microtubule doublets plus two central microtubules (and is therefore called a 9+2 axoneme). conventional motile cilium This type of cilia may be present in solitary (so-called flagella, e.g. in sperm) or in multiple copies (so-called conventional motile cilia, e.g. in tracheal epithelium, ependyma or oviduct epithelium). pr sperm flagellum 2016-09-27T15:26:34Z GO:0097729