All proteins in this family for which funcitons are known are DNA-DNA helicases that funciton in the initiation of transcription and nucleotide excision repair as part of the TFIIH complex. This family is based on the phylogenomic analysis of JA Eisen (1999, Ph.D. Thesis, Stanford University). [DNA metabolism, DNA replication, recombination, and repair]
Jiyao W et al.(2023). "The conserved domain database in 2023.",