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. Author manuscript; available in PMC: 2014 Jul 3.
Published in final edited form as: Phys Biol. 2011 Jul 12;8(4):045003. doi: 10.1088/1478-3975/8/4/045003

Figure 5. Concavity of BR expression across Drosophila species.

Figure 5

(A): Examples of eggshells with 2 (D. yakuba), 3 (D. phalerata) , or 4 (D. virilis) appendages.

(B): BR expression patterns in each species at stage 10, when elevated BR domains are first specified, but before tube morphogenesis is initiated. The dorsal midline is indicated with yellow arrowheads. In addition to the shape of the roof domain that has high levels of BR, the posterior FCs also have a basal level of BR – which the current model does not include.

(C): Model predictions of BR patterns with different values of inhibitory feedback strength. In D. phalerata and D. virilis, any regulation from BR was excluded, and relative threshold values were modified to more closely fit each expression pattern, but the shapes of the GRK and DPP gradients were held constant. Model parameters are specified in the Materials and Methods chapter.