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Primary structure of a precursor to the asprartic proteinase from Rhizomucor miehei shows that the enzyme is synthesized as a zymogen

In order to characterize the zymogen of the milk‐clotting enzyme from Rhizomucor miehei, we constructed a cDNA library on pBR327 in Escherichia coli. Aspartic proteinase‐specific recombinants were isolated by colony hybridization to a specific oligonucleotide mixture, and the cDNA sequence corresponding to a precursor form of the enzyme was determined.