Mike,  (01)
The Gene Ontology Consortium has a few: http://www.geneontology.org/  (02)
Also, in medicine, UMLS: http://www.nlm.nih.gov/research/umls/
MESH: http://www.nlm.nih.gov/mesh/filelist.html.  (03)
Leo  (04)
"Uschold, Michael F" wrote:  (05)
> Can anyone point to some very large ontologies that are in routine use? I
> know there are some in the medical informatics area, but am unsure of what
> they are called. One is on the order of 35K items, perhaps in genetics.
>
> If anyone can supply any details I would be grateful.
>
> Thanks
> Mike Uschold
>
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Dr. Leo Obrst The MITRE Corporation
mailto:lobrst@xxxxxxxxx Intelligent Information Management/Exploitation
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at http://ontolog.cim3.org/forums/ontolog  (08)