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Biological chemistry - nucleic acids
Molecular Modeling Database (MMDB)

Experimentally resolved structures of proteins, RNA, and DNA, derived from the Protein Data Bank (PDB). [Publisher: National Institutes of Health (NIH), USA]

Nucleic Acid Database (NDB)

Experimentally-determined nucleic acids and complex assemblies. [Publisher: Rutgers University, USA]

OCA

Database of protein structure and function. [Publisher: Weizmann Institute of Science, Israel]

PDBREPORT

Structural problems in PDB entries that have been determined using X-ray diffraction or NMR techniques. [Publisher: Netherlands Bioinformatics Centre]

RCSB PDB

Biological Macromolecular Resource - The PDB archive contains information about experimentally-determined structures of proteins, nucleic acids, and complex assemblies. [Publisher: University of California, San Diego and Rutgers University]

UniProt

The Universal Protein Resource, a comprehensive resource for protein sequence and functional annotation data. [Publisher: European Bioinformatics Institute (EMBL-EBI), the Swiss Institute of Bioinformatics (SIB) and the Protein Information Resource (PIR)]