Evolution of a coronavirus during persistent infection in vitro.
D000818:Animals; D002460:Cell Line; D003588:Cytopathogenic Effect, Viral; D066298:In Vitro Techniques; D051379:Mice; D008807:Mice, Inbred BALB C; D006517:Murine hepatitis virus / Q000235:genetics / Q000254:growth & development* / Q000648:ultrastructure; D009154:Mutation; D013696:Temperature; D014779:Virus Replication