title: An introduction to microtubules.
mesh_terms: D000818:Animals; D002454:Cell Differentiation; D002642:Chick Embryo; D002645:Chickens; D002923:Cilia / Q000378:metabolism / Q000648:ultrastructure; D056890:Eukaryota / Q000378:metabolism / Q000648:ultrastructure; D007908:Lens, Crystalline / Q000502:physiology; D008297:Male; D008854:Microscopy, Electron; D008870:Microtubules / Q000378:metabolism / Q000648:ultrastructure*; D013091:Spermatogenesis; D013094:Spermatozoa / Q000378:metabolism