1.14.16.1	(6R)-5,6,7,8-tetrahydro-L-monapterin	7% of the activity with tetrahydrobiopterin	687580	
1.14.16.1	(6R)-L-erythro-5,6,7,8-tetrahydrobiopterin	-	699374, 712471	
1.14.16.1	(6R)-L-erythro-5,6,7,8-tetrahydrobiopterin	i.e. 6(R)BH4, essential cofactor	673511	
1.14.16.1	(7R)-tetrahydrobiopterin	8fold lower affinity and activity compared with 6(R)BH4	673511	
1.14.16.1	(7S)-tetrahydrobiopterin	8fold lower affinity and activity compared with 6(R)BH4	673511	
1.14.16.1	5,6,7,8-tetrahydro-L-biopterin	-	659643, 696226, 697593, 697799, 697830, 699022, 699060, 699235, 699316, 699746, 700231, 701083	
1.14.16.1	5,6,7,8-tetrahydro-L-biopterin	PAH can be activated up to 20times in the presence of its natural cofactor 5,6,7,8-tetrahydro-L-biopterin but cannot be activated in the presence of synthetic cofactors such as 6,7-dimethyltetrahydrobiopterin or 6-methyltetrahydropterin	700235	
1.14.16.1	5,6,7,8-tetrahydrobiopterin	-	672057	
1.14.16.1	6,7-dimethyl-5,6,7,8-tetrahydrobiopterin	-	659519	
1.14.16.1	6,7-dimethyltetrahydropterin	17% of the activity with tetrahydrobiopterin	687580