The Entrez Nucleotide database is a collection of sequences from several sources, including GenBank, RefSeq, and PDB. The number of bases in these databases continues to grow at an exponential rate. As of April 2006, there are over 130 billion bases in GenBank and RefSeq alone.
Bio2RDF - GenBank. Bio2RDF.
Retrieved 18:31, May 24, 2013 (UTC).
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