Table 1.

Summary of the alignments discussed

	Zebrafish	Xenopus	Human	Mouse
Ontologya	ZFA	XAO	EHDAA	EMAPA
Number of terms	1974	569	2327	3525
with synonyms	1080	122	0	0
with definitions	772	186	0	0
Number of validationsb	189		1959
Number of invalidations	543		1003
Number of unique terms aligned	183	182	1541	1754

^aReferences for the ontologies aligned are: ZFA (Sprague et al., 2006) (version of 24:10:2007); XAO (Bowes et al., 2008) (version of 07:11:2007); EHDAA (Aitken, 2005; Hunter et al., 2003) (version of 08:04:2005); EMAPA (Aitken, 2005; Baldock et al., 2003) (version of 08:04:2005).

^bIncluding ‘partial’ validations.