2.7.1.6	4	-	very labile below	
2.7.1.6	4.5	-	37°C, 10 min, about 20% loss of activity	
2.7.1.6	4.5	6.5	25°C, 30 min, stable	
2.7.1.6	5.4	8.8	24 h, less than 20% loss of activity	
2.7.1.6	6	-	stable above	
2.7.1.6	7	-	stable