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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 16-25. Photomicrographs of embryos that exhibit homeotic gene-encoded protein expression patterns in Drosophila. (a) SCR; (b) ANTP; (c) UBX; (d) ABD-B. Note that the anterior boundary of homeotic gene expression is ordered from SCR (most anterior) to ANTP, UBX, and ABD-B (most posterior). (e) This order is matched by the linear arrangement of the corresponding genes along chromosome 3. (Parts a and b from T. C. Kaufman, Indiana University. Parts c and d from S. Celniker and E. B. Lewis, California Institute of Technology.)

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