This family consists of several Borna disease virus P10 (or X) proteins. Borna disease virus (BDV) is unique among the non-segmented negative-strand RNA viruses of animals and man because it transcribes and replicates its genome in the nucleus of the infected cell. It has been suggested that the p10 protein plays a role in viral RNA synthesis or ribonucleoprotein transport.
Jiyao W et al.(2023). "The conserved domain database in 2023.",