title: Capsid structure of satellite phage P4 and its P2 helper.
mesh_terms: D002213:Capsid / Q000032:analysis* / Q000096:biosynthesis; D003090:Coliphages / Q000648:ultrastructure*; D006378:Helper Viruses / Q000502:physiology; D008433:Mathematics; D012526:Satellite Viruses / Q000254:growth & development; D014764:Viral Proteins / Q000032:analysis*
chemical_list: D014764:Viral Proteins