Accession numbers contain only alphanumeric characters.
Multiple accession numbers may be represented in separate accession data items or within the same data item separated by single backslash characters. These numbers are being reassociated with the sequence as reported in a publication or as submitted to the databases. In accordance with their refined definition, they constitute unique labels that provide an identity to the reported sequence. As these labels will remain permanently associated with this information, they may continue to serve as tags to locate the information in any future releases of the database. For the next few releases these numbers will redundantly appear in this old location.