1. Crystalline Enzymes;Northrop,1948
2. Studies on proteolytic activity of crystalline protein B prepared from beef pancreas;Keith;J Biol Chem,1947
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4. Amino acid sequence of bovin chymotrypsinogen;Hartley;Nature (London),1964
5. On the structure and function of bovine trypsinogen and trypsin;Walsh;Proc Nat Acad Sci USA,1964