1.13.11.87 proteolytic modification calculated molecular mass is 73800 Da for precursor protein, and 70300 Da for mature protein 1.13.11.87 proteolytic modification the preprotein has a MW of 45200 Da, the mature protein has MW of 42200 Da 1.13.11.87 proteolytic modification the preprotein has a MW of 73800 Da, the mature protein has MW of 71500 Da 1.13.11.87 proteolytic modification the preprotein has a MW of 74000 Da, the mature protein has MW of 70800 Da