4.1.3.36	-20°C, E. coli K-12, not less than 6 weeks	
4.1.3.36	-20°C, Mycobacterium phlei, in 3-(N-morpholino)propanesulfonic acid buffer, pH 6.9, 0.2 mM DTT, 20% DMSO, not less than 6 weeks