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| Modern Genetic Analysis Chapter 16. The Genetic Basis of Development Forming Complex Pattern: Utilizing Positional Information to Establish Cell Fates Figure 16-21. Scanning electron micrographs of (a) a 3-hour Drosophila embryo, (b) a 10-hour embryo, and (c) a newly hatched larva. Note that, by 10 hours, the segmentation of the embryo is obvious. Lines are drawn to indicate that the segmental identity of cells along the AP axis is already fated early in development. The abbreviations refer to different segments of the head (CL, PC, O, D, Mx, Ml, Lb), thorax (T1 to T3), and abdomen (A1 to A8). (T. C. Kaufman and F. R. Turner, Indiana University.)

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