1.3.7.7	4°C, NB- and L-protein subunits of the crude extract when maintained anaerobically, more than 6 months, remain stable with no significant loss of activity	
1.3.7.7	4°C, NB- and L-protein subunits of the purified extract when maintained anaerobically, both activities of the components are rapidly lost during purification procedures such as affinity chromatography with S-protein agarose