title: Fenestrations of sarcoplasmic reticulum. Delineation by lanthanum acting as a fortuitous tracer and in situ negative stain.
mesh_terms: D000818:Animals; D003964:Diaphragm / Q000166:cytology*; D007811:Lanthanum; D051379:Mice; D008809:Mice, Inbred C3H; D008854:Microscopy, Electron; D012519:Sarcoplasmic Reticulum; D013194:Staining and Labeling
chemical_list: D007811:Lanthanum