This domain family is found in viruses, and is approximately 70 amino acids in length. The family is found in association with pfam05407. The rubella virus (RUB) nonstructural (NS) protein (NSP) ORF encodes a protease that cleaves the NSP precursor (240 kDa) at a single site to produce two products.
Jiyao W et al.(2023). "The conserved domain database in 2023.",