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| Modern Genetic Analysis Chapter 16. The Genetic Basis of Development Forming Complex Pattern: Establishing Positional Information Figure 16-17. A mature oocyte. The follicle cells that built and surrounded the eggshell have been discarded, and the plasma membrane of the oocyte is interior to the eggshell. Note the polar granules at the posterior end of the oocyte. (Modified from Christiane Nüsslein-Volhard, Development, Suppl. 1, 1991, 1.)

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