3.4.21.101	D348A	production of a 64000 Da precursor protein which is not processed to active enzymes under acidic conditions, no catalytic acticity detected	
3.4.21.101	DELTA192	pro-region mutant enzyme	
3.4.21.101	S169A	production of a 64000 Da precursor protein which is not processed to active enzymes under acidic conditions, no catalytic acticity detected	
3.4.21.101	S79A	production of a 64000 Da precursor protein which is not processed to active enzymes under acidic conditions, no catalytic acticity detected