rennin

n. enzyme used to curdle milk and produce cheese, active component in rennet (derived from the mucous membrane of the fourth stomach of young cows)

Chymosin (or rennin) is an aspartic acid protease enzyme found in rennet. It is produced by the cow of its lining of the abomasum (its fourth stomach).Bovine chymosin is produced nowadays recombinantly in E.coli, Aspergillus niger var awamori and K.lactis as alternative resource to the one from the cows.The gene is found in humans (on chromosome 1), but it is not in a functioning form.
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Rennin /ren·nin/ chymosin. ren·nin n. A milk-coagulating enzyme found especially in the gastric juice of the fourth stomach of young ruminants, used [more]Rennin - Community and Resources

Noun
1. an enzyme that occurs in gastric juice; causes milk to coagulate
(synonym) chymosin
(hypernym) enzyme
(substance-holonym) gastric juice

n. rennin, enzyme used to curdle milk and produce cheese, active component in rennet (derived from the mucous membrane of the fourth stomach of young cows)