胰凝乳蛋白酶抑制因子存在多型性，其表达受基因复合体控制。蛋白酶抑制因子对发育、变态、调节蚕体代谢和蚕体防御机能起着重要作用。
The chymotrypsin inhibitors of the silkworm, which displayed polymorphic patterns, were controlled by gene complexes, and played an important role in development, metamorphosis and resistibility.
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