2.3.1.92	D172E/S175A	mutant, relative activity 15%	706128	
2.3.1.92	D358A	mutant, relative activity 20%	706128	
2.3.1.92	H411A	mutant, no activity	706128	
2.3.1.92	N73A	mutant, relative activity 13%	706128	
2.3.1.92	R322E	mutant, relative activity 1%	706128	
2.3.1.92	S173A	mutant, no activity	706128