Last updated:2016.1.25.

Accession Number Assigned by INSD


INSD (the International Nucleotide Sequence Databases) are composed of DDBJ, ENA and NCBI, and collect experimentally determined nucleotide sequence data and the TPA data. INSD accept the direct submission of the sequence data that is made online by researchers all over the world.

A unique accession number issued by INSD for each record is defined as the INSD accession number.
The number is internationally recognized to guarantee the submitter the property of the submitted and published data.


Format of the INSD Accession Number

INSD accession number is composed of alphabet letters and digits.
The alphabet part is called "prefix". See the prefix list.
The formats of INSD accession numbers are varied in accordance with categories of data as follows.

Annotated/Assembled Data

DDBJ (traditional DDBJ) with EMBL-Bank/ENA and GenBank

general; 1 alphabet letter and 5 digits (ex. A12345) or 2 alphabet letters and 6 digits (ex. AB123456)
WGS, TSA; 4 alphabet letters (For Large Scale Data (four prefix)) and 8 to 10 digits: ex. AAAA01012345
MGA; 5 alphabet letters and 7 or more digits: ex. AAAAA1234567
protein_id; 3 alphabet letters (protein_id prefix list) and 5 digits: ex. AAA12345

Raw Output Data from Sequencers

Trace Archive
2 alphabet letters (TI only) and 1 or more digits: ex. TI12345678
Sequece Read Archive
3 alphabet letters (SRA prefix list) and 6 or more digits: ex. DRA000001


5 alphabet letters (BioProject prefix list) and 1 or more digits: ex. PRJDA123
4 alphabet letters (BioSample prefix) and 8 digits: ex. SAMD00000001


Some ID numbers confused with the INSD Accession Number

Though often confused, the followings are not the INSD accession numbers;

Numbers issued by other than INSD
RefSeq numbers: ex. NC_123456, NM_123456
Ensembl numbers: ex. ENSG00000139618
UniProt accession numbers: ex. P12345, Q01234