*Sequence number* is assigned manually or by a computer system to ensure there are
no duplicates. Some institutes prefer to zero-pad the number `00000102`.
The *suffix* allows differentiating samples of the same original material. The
exact meaning of the suffix is different for every institute.
[cols="1,1,1,2", options="header"]
.Example accession numbers
|===
|Prefix|Sequence number|Suffix|Accession number
|TMe|419||TMe-419
|TVSu|13||TVSu-13
|===
[[accedoc-other]]
=== Other accession identifiers
Material enters the collection by collecting, from breeding programs,
or acquisition from other institutes. In each case, the material will already have some
identifier assigned by the collector, breeder or other institute.
*Accession name* is the vernacular name of the material and is commonly captured by
the collector or assigned by the breeder.
[[accedoc-coll]]
==== Collected material
Genebank accessions obtained through collecting missions should maintain data about the site and dates of the
collecting and collector information.
[[accedoc-bred]]
==== Breeders material
Lines developed by breeding programs of the institute may be included the collection. Information provided by the breeders
should include the pedigree, ancestral information of the material, along with names and identifiers used by the breeding
program and the codes and names of institutes that developed the material.
[[accedoc-acq]]
==== Acquisitions
Material coming from other institutes and genebanks must be accompanied by accession passport data
as documented in the source genebank.
NOTE: *Country of origin* is the country where the material was collected or bred, not the country of source genebank.
Accession documentation should capture any identifiers provided by the source institute. This data
allows for validation and curation of passport data between the genebanks and allows researchers
to obtain material from either collection.
[[accedoc-tax]]
=== Taxonomy
Accession genus, species, species author, subtaxon and subtaxon authority are usually
known, but are subject to change after expert identification or change in taxonomic system.
https://npgsweb.ars-grin.gov/gringlobal/taxon/abouttaxonomy.aspx[GRIN Taxonomy for Plants] and the Mansfeld database can serve for validating accession taxa.
[[accedoc-storage]]
=== Storage and maintenance
Ex situ genebanks maintain PGR material as seed, in the field, in vitro, cryo or in DNA collections.
Inventories (lots) of one accession may be managed by different methods (e.g. seed and cryo).
See <<mcpd-storage,Storage>> in MCPD standard on how to capture multiple types of storage.
