Table 2: Examples of persistent, citable URLs for a single accession (NCBI Taxon 9606), with default and specified providers.

From: Uniform resolution of compact identifiers for biomedical data

Compact ID Provider Persistent Citable URLs Resolves to
taxon:9606 If not specified, defaults to NCBI https://identifiers.org/taxon:9606 NCBI Taxonomy, accession number 9606, NCBI primary
    https://n2t.net/taxon:9606  
taxon:9606 NCBI (ncbi) https://identifiers.org/ncbi/taxon:9606 NCBI Taxonomy, accession number 9606, NCBI
    https://n2t.net/ncbi/taxon:9606  
taxon:9606 Ontology Lookup Service (ols) https://identifiers.org/ols/taxon:9606 NCBI Taxonomy, accession number 9606, OLS
    https://n2t.net/ols/taxon:9606  
taxon:9606 NCBO BioPortal (bptl) https://identifiers.org/bptl/taxon:9606 NCBI Taxonomy, accession number 9606, BioPortal
    https://n2t.net/bptl/taxon:9606