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The NPO is also included in the NCI metathesaurus (NCIm), which can be  accessed at  http://ncimeta.nci.nih.gov/ . The NCI metathesaurus contains about 3,600,000 terms from over 76 vocabularies, and these terms are mapped to about  1,400,000 biomedical concepts. Terms from multiple vocabularies that are mapped to a single biomedical concept allows the user to choose from the multiple vocabularies to annotate data.  Simultaneously, this facilitates discovery of vocabularies unknown to the user.  By the inclusion of NPO into the NCI metathesaurus, we expect that NPO accessibility and usage will be extended within the NCIm;  NPO will add semantics into the NCIm;  and that NCIm users will be able to take advantage of the knowledge provided by NPO.  

Collaboration

The NPO is also be available on the BiomedGT semantic media wiki (SMW) at http://biomedgt.nci.nih.gov/wiki/index.php/NPO for facilitating collaborative development of ontology with the community.

Documentation

A documentation wiki that provides the documentation for NPO is available at http://www.nano-ontology.org.
The ontology URI of NPO is http://purl.bioontology.org/ontology/npo