1.14.99.63	alr3189, beta-C-4 oxygenase, beta-C-4-oxygenase, beta-carotene 4,4'-oxygenase, beta-carotene 4-monoketolase, beta-carotene ketolase, bkt, bkt1, BKT3, CrBKT, CrtO, CrtO beta-carotene ketolase, CrtO ketolase, crtS, CrtW, CrtW ketolase, CrtW148, CrtW38, DR0093, OBKT, ObktM, sCrBKT, slr0088	-	
1.14.99.63	beta-carotene ketolase, bkt	ambiguous	
1.14.99.63	OBKTM29	mutant enzyme	
1.14.99.63	beta-carotene 3-hydroxylase/4-ketolase	the enzyme from the yeast Xanthophyllomyces dendrorhous is bifunctional and also catalyses the activity of beta-carotene 3-hydroxylase