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Stages of chorion formation. Apical pole of the basal oocyte of Blattella germanica ovaries in different stages of choriogenesis. A) day 7 just before the first symptoms of chorion secretion, B) day 7, early chorion stage (7EC), C) day 7, mid chorion stage (7MC), and D) late chorion stage (7LC). The process from 7EC to 7LC lasts 15 h approximately. Scale: 50 μm.
