Today, purified chymosin is alsomanufactured through genetic modification of microorganism whenthe chymosin gene from a calf is duplicated and inserted into microbial cells.

• 现在，从小牛身上获得的凝乳酶基因经过复制注入到微生物细胞中后，通过微生物转基因可以生产提纯的凝乳酶。