2.7.2.8	L-arginine protects against inactivating effects of high concentrations of urea	
2.7.2.8	L-arginine protects against the inactivating effects of heat	
2.7.2.8	loss of activity on repeated freezing and thawing	
2.7.2.8	urea, 4.0 M, complete loss of activity after 120 min