This family may represent an RNA dependent RNA polymerase. The family also contains the following proteins: 2A protein from bromoviruses putative RNA dependent RNA polymerase from tobamoviruses Non structural polyprotein from togaviruses

1: Roles of nonstructural polyproteins and cleavage products in regulating Sindbis virus RNA replication and transcription. Lemm JA, Rice CM; J Virol 1993;67:1916-1926. PMID:8445717

2: Complete replication in vitro of tobacco mosaic virus RNA by a template-dependent, membrane-bound RNA polymerase. Osman TA, Buck KW; J Virol 1996;70:6227-6234. PMID:8709249

3: Bromovirus RNA replication and transcription require compatibility between the polymerase- and helicase-like viral RNA synthesis proteins. Dinant S, Janda M, Kroner PA, Ahlquist P; J Virol 1993;67:7181-7189. PMID:8230440

4: Evolution and taxonomy of positive-strand RNA viruses: implications of comparative analysis of amino acid sequences. Koonin EV, Dolja VV; Crit Rev Biochem Mol Biol 1993;28:375-430. PMID:8269709