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.
而一旦细胞的抗癌防御系统被摧毁，遗传混乱就会随之而来，于是又进一步加剧了基因突变的程度，而且染色体中的DNA将产生大规模重组。
Once the cell’s anticancer defenses are destroyed, genetic mayhem ensues, with further mutations and wholesale rearrangements of DNA in the chromosomes.
科学家们曾经错误的以为大脑有自己的自成一体的免疫防御系统，与身体的其他部分封闭下来。
Scientists had thought that brains had their own, self-contained immune defenses, sealed off from the rest of the body.
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