MAIN DATABASES ACCESIBLE WITH ENTREZ PubMed: Bibliographic references in Molecular Biology and Medicine. Nucleotide: Composite database of DNA sequences from Genbank, EMBL and DDBJ, plus other databases or projects such as RefSeq. RefSeq contains nucleotide sequences from the Nucleotide database that have been curated or re-annotated, by the NCBI. Protein: Proteins sequences derived from translation of DNA sequences in GenBank, EMBL y DDBJ, plus sequences from PIR, SWISSPROT and Protein Data Bank (PDB). Genome: Complete genomes, chromosomes, contig maps, physical maps.