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| Modern Genetic Analysis Chapter 16. The Genetic Basis of Development Binary Fate Decisions: the Germ Line Versus the Soma Figure 16-12. Pole-cell formation at the syncitial stage of the early Drosophila embryo. (a) A scanning electron micrograph of a Drosophila embryo with the egg shell removed. Note that the pole cells (the cap of cells on top of the embryo) lie outside the somatic syncitium. (b) A diagram of a longitudinal section through the embryo in part a, showing that the germ-line cellsthe pole cellshave formed, whereas the soma still consists of syncitial nuclei (modified from F. R. Turner and A. P. Mahowald, Developmental Biology 50, 1976, 95.)

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