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NCBI : National Centre for Biotechnology Information
NCBI advances science and health providing access to biomedical and genomic information.

EMBL : European Molecular Biology Laboratory

DDBJ : DNA Data Bank of Japan

DDBJ; DNA Data Bank of Japan is the sole nucleotide sequence data bank in Asia, which is officially certified to collect nucleotide sequences from researchers....


a curated protein sequence database which strives to provide a high level of annotation (such as the description of the function of a protein, its domains structure, post-translational modifications, variants, etc.), a minimal level of redundancy and high level of integration with other databases

PIR: Protein Information Resource
The Protein Information Resource (PIR) is an integrated public bioinformatics resource to support genomic, proteomic and systems biology research and scientific studies.
PDB : Protein Data Bank
The Protein Data Bank (PDB) archive is the single worldwide repository of information about the 3D structures of large biological molecules, including proteins and nucleic acids.