ProtBuD: a database of biological unit structures of protein families and superfamilies. - Qifang Xu; Adrian A. Canutescu; Zoran Obradovic; Roland L. Dunbrack Jr. (Bioinform., 2006)

The protein common interface database (ProtCID) - a comprehensive database of interactions of homologous proteins in multiple crystal forms. - Qifang Xu; Roland L. Dunbrack Jr. (Nucleic Acids Res., 2011)

Assignment of protein sequences to existing domain and family classification systems: Pfam and the PDB. - Qifang Xu; Roland L. Dunbrack Jr. (Bioinform., 2012)

PyIgClassify: a database of antibody CDR structural classifications. - Jared Adolf-Bryfogle; Qifang Xu; Benjamin North; Andreas Lehmann; Roland L. Dunbrack Jr. (Nucleic Acids Res., 2015)

The protein common assembly database (ProtCAD) - a comprehensive structural resource of protein complexes. - Qifang Xu; Roland L. Dunbrack Jr. (Nucleic Acids Res., 2023)