Table 1.

Evolution of AMA and NCI-A and the reference alignment

	AMA	NCI-A	Reference alignment
2007	2744 concepts,	3304 concepts,	1544 equivalence relations
	3 object properties,	2 object properties,
	ca 4500 subsumption axioms	ca 5500 subsumption axioms
2008	Same as earlier	Same as earlier	Removed 20 correspondences
2010	Added 12 subsumption axioms	Added 3 subsumption axioms	Weakened 2 correspondences
	Removed 6 subsumption axioms	Removed 3 subsumption axioms	Removed 1 correspondence
		Added 17 disjointness axioms
2011	Same as earlier	Same as earlier	Added 28 correspondences
			Removed 24 correspondences