Accession number (bioinformatics)

An accession number, in bioinformatics, is a unique identifier given to a DNA or protein sequence record to allow for tracking of different versions of that sequence record and the associated sequence over time in a single data repository. Because of its relative stability, accession numbers can be utilized as foreign keys for referring to a sequence object, but not necessarily to a unique sequence.

Source: Wikipedia — Accession number (bioinformatics) (CC BY-SA 4.0)