Are Accessions from the DDBJ/EBI/NCBI collaboration treated specially?
Yes, while accession appears in several of the identifiers described above, Accessions assigned by the International Nucleotide Sequence Database Collaboration between the DDBJ, EBI (EMBL) and NCBI are guaranteed unique by these organizations. To reflect their special nature, the collaborations Accessions are labeled coll-accession in Table 1. These Accessions are all treated as being derived from the same identifier name space. Consequently, xdget can retrieve a sequence by Accession (or rather coll-accession) without having to know specifically which of the collaborating organizations assigned the identifier. Locus and Entry identifiers do not work this way, however, as the uniqueness of these identifiers is not controlled between the collaborators.
