It is indicated that chimozine is relative to the forming of peritrophic membrane (PMb) and the den-sity of PMb determined whether Nosema Apis Zander can inject in the ventriculus epithelium.

中肠酪素酶中肠围食膜的形成有关，而围食膜的致密定了微孢子虫能否侵入中肠上皮细胞。