to the original Rous tumour virus, lack the env gene, it is likely that the ancestral virus was also replicationdefective. – See Vogt PK (2019) for discussion
Mammal-prion Fungi-prion 缺损干扰 RNA Defective Interfering RNA Defective interfering particle Fields p. 27 As defined therein, "a virus species is a polythetic class
potent activity against both human immunodeficiency virus and human cytomegalovirus replication in vitro. J. Infect. Dis. 1995, 172 (2): 380–8. PMID 7622881