title: Morphology of small and large plaque variants of the Blacksburg strain of Newcastle disease virus.
mesh_terms: D002499:Centrifugation, Density Gradient; D006389:Hemagglutinins, Viral / Q000032:analysis; D008854:Microscopy, Electron; D009522:Newcastle disease virus
chemical_list: D006389:Hemagglutinins, Viral