This family includes RNA helicases thought to be involved in duplex unwinding during viral RNA replication. Members of this family are found in a variety of single stranded RNA viruses.

1: Two related superfamilies of putative helicases involved in replication, recombination, repair and expression of DNA and RNA genomes. Gorbalenya AE, Koonin EV, Donchenko AP, Blinov VM; Nucleic Acids Res 1989;17:4713-4730. PMID:2546125