Then they add a substance usually harvested from veal stomachs called rennet, a mixture of enzymes that slice the ends off caseins, a kind of milk protein.
这种物质一般从小牛的胃中采集而来，里面含有的多种酶能够切断牛奶中的一种蛋白——酪蛋白的水溶性末端。
2
The bioactive peptides maybe differ from different food proteins, and milk proteins (such as caseins and whey proteins) are those proteins which contain the most bioactive peptides.