摘要
Ⅰ. INTRODUCTION During the course of ovary development of insect, a layer of vitelline membrane is secreted by follicle cells around an oocyte after the yolk is deposited in the oocyte. Then, the oocyte begins to take up water from hymolymph and its volume gradually expands. Since then, the stage of choriogenesis starts. Chorionins (egg-shell proteins)
