title: Contractile structures in endothelial cells of splenic sinusoids.
mesh_terms: D000375:Aging; D000818:Animals; D003593:Cytoplasm / Q000648:ultrastructure; D004727:Endothelium / Q000648:ultrastructure*; D008854:Microscopy, Electron; D051381:Rats; D013154:Spleen / Q000254:growth & development / Q000648:ultrastructure*; D013194:Staining and Labeling; D013997:Time Factors