1.13.99.1	-20°C for weeks or months: activation -20°C, completely active even in absence of Fe(II) and cysteine for days to weeks at pH 6.0 with 1 mM glutathione	
1.13.99.1	-20°C, extensive loss of activity after 1 or 2 days	
1.13.99.1	0°C, 12 h, extensive loss of activity