3.6.1.22	7	-	-	209949	
3.6.1.22	7.5	-	-	209959	
3.6.1.22	8	-	enzyme activity rapidly decreases below pH 7.5	720498	
3.6.1.22	8.5	-	-	209957, 209959	
3.6.1.22	8.8	-	-	209948