title: Evidence for quasi species in severe acute respiratory syndrome-associated coronavirus deletion mutants.
authors.forename: Stephen J
authors.initials: SJ
authors.lastname: Seligman
mesh_terms: D016679:Genome, Viral; D006801:Humans; D045473:Severe acute respiratory syndrome-related coronavirus / Q000145:classification* / Q000235:genetics* / Q000302:isolation & purification; D017384:Sequence Deletion; D045169:Severe Acute Respiratory Syndrome / Q000821:virology*