title: Internal medulla of hair revealed by scanning electron microscopy.
mesh_terms: D000818:Animals; D002415:Cats; D006197:Hair / Q000166:cytology / Q000648:ultrastructure*; D008855:Microscopy, Electron, Scanning / Q000295:instrumentation / Q000379:methods; D009115:Muridae; D009893:Opossums; D012756:Sheep; D012788:Shrews