title: A method for ultra-thin sectioning of microscopical structures in a predetermined direction.
mesh_terms: D000818:Animals; D002642:Chick Embryo; D006321:Heart / Q000033:anatomy & histology; D006651:Histocytochemistry; D008722:Methods; D008854:Microscopy, Electron; D008867:Microtomy / Q000295:instrumentation