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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 16-23. Photomicrographs showing the early embryonic expression patterns of gap and pair-rule genes. (a) Early blastoderm expression patterns of proteins from three gap genes: hb-z, Kr, and kni. (b) Late blastoderm expression patterns of proteins from two pair-rule genes: ftz (stained gray) and eve (stained brown). Note the localized gap gene expression patterns compared with the reiterated pair-rule gene expression pattern. (Part a from M. Hulskamp and D. Tautz, BioEssays 13, 1991, 261. Part b from Peter Lawrence, The Making of a Fly. Copyright © 1992 by Blackwell Scientific Publications.)

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