1 Department of Chemistry and Chemical Biology, Center for Integrative Proteomics Research, Rutgers, The State University of New Jersey, 174 Frelinghuysen Road, Piscataway, NJ 08854, USA.
2 PDBe, European Molecular Biology Laboratory-European Bioinformatics Institute, Cambridge CB10 1SD, UK.
3 PDBj, Institute for Protein Research, Osaka University, 3-2 Yamadaoka, Suita, Osaka, 565-0871, Japan.
4 BioMagResBank, Department of Biochemistry, University of Wisconsin-Madison, Madison, WI 53706, USA.