Only changes to the sequence data trigger assignment of a new gi minor updates are tracked, but don't change the gi or version number. Note that the gi number doesn't change every time the record is modified.
That is, when any change is made to a sequence, it both receives a new GI number, and the version part of its accession number is incremented by 1.įor example, here is the sequence revision history of Reference Sequence Human Chromosome 1, as of October 2014: The two systems of identifiers run in parallel to each other. A sequence Accession number without a version suffix always refers to the latest version of the sequence.
Ncbi nucleotide series#
(This identifier is often referred to as an " accession dot version ".) The base Accession number identifies the sequence record, and the version suffixes form the series of versions, starting with 1 1. A sequence version number consists of a base Accession number, a dot, and a version suffix that starts with 1 1. Sequence VersionsĪ sequence Version groups all of the gi numbers for a specific sequence into an ordered series. A protein sequence GI number is shown in the VERSION field of a protein database record, and is cross-referenced in the CDS/db_xref field of a nucleotide database record. Each time a sequence record is changed, it is assigned a new GI number.Ī nucleotide sequence GI number is shown in the VERSION field of the database record. The GI number bears no resemblance to the Version number of the sequence record. GI numbersĪ GI number (for GenInfo Identifier, sometimes written in lower case, " gi ") is a simple series of digits that are assigned consecutively to each sequence record processed by NCBI. The two identifier types differ in format, and were implemented at different times. Many sequences have two types of identification numbers, GI and VERSION.
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