“…Calf rennet, which has been utilized for cheesemaking for a long time, consists of milk clotting enzymes. Commercial rennets, depending on the age and diet of the calf, may contain 45–80 % chymosin, an enzyme that breaks a specific bond in κ-CN, leading to the aggregation of CN micelles and the clotting of milk [ 2 , 3 ].…”