So, proteins that were first used to fight fungal  parasites eventually became chitinase - the enzyme in the digestive fluid of the pitcher plants  that breaks down those crunchy exoskeletons.

因此，最初用于对抗真菌寄生虫的蛋白质最终变成了几丁质酶——猪笼草消化液中的一种酶，可以分解那些松脆的外骨骼。