3.5.4.10	5.5	-	1 h, enzyme retains 20% of its IMP cyclohydrolase activity	756701	
3.5.4.10	6	-	1 h, enzyme retains 60% of its IMP cyclohydrolase activity	756701	
3.5.4.10	6.5	10	1 h, quite stable over a broad pH range from 6.5 to 10	756701