title: Demonstration of an external layer in several species of the genus Brucella.
mesh_terms: D000942:Antigens, Bacterial / Q000032:analysis; D002002:Brucella / Q000276:immunology / Q000648:ultrastructure*; D008854:Microscopy, Electron; D012430:Ruthenium Red; D013194:Staining and Labeling
chemical_list: D000942:Antigens, Bacterial; D012430:Ruthenium Red