3.5.5.5	3	7	-	
3.5.5.5	5	9	-	
3.5.5.5	4.5	-	about 45% activity at pH 4.5 compared to the pH optimum at 7.0	
3.5.5.5	5	-	about 70% activity at pH 5.0 compared to the pH optimum at 7.0	
3.5.5.5	6.4	9.4	about half-maximal activity at pH 6.4 and 9.4, 2-thiopheneacetonitrile as substrate	
3.5.5.5	6.5	10	pH 6.5: about 65% of maximal activity, pH 10.0: about 70% of maximal activity