How orthogonal are the OBO Foundry ontologies?

Table 4 The amount of overlap for the six OBO Foundry members.

Ontology	# of Overlapping Terms	Ontology Size (# of terms)	% of Overlapping Terms
XAO	115	791	15%
ZFA	113	2,475	5%
PATO	4	1,263	0.3%
PRO	9	11,905	0.08%
GO	12	29,983	0.04%
CHEBI	8	24,225	0.03%

Column (1) is the ontology id; (2) is the number of terms that overlap with a term from another ontology; (3) is the ontology size; (4) is the percent of terms from the ontology that overlap with a term from another ontology.

ISSN: 2041-1480