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| Modern Genetic Analysis Chapter 16. The Genetic Basis of Development Forming Complex Pattern: Establishing Positional Information Figure 16-13. The gradients of BCD and HB-M proteins. The BCD gradient is steeper, and the BCD protein is not detectable in the posterior half of the early Drosophila embryo. The HB-M gradient is shallower, and HB-M protein can be detected well into the posterior half of the embryo.

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