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A model for the regulation of tll and hkb. (a) A regulatory network of anterior tll and hkb by the three maternal signals. (b) A regulatory network of posterior tll and hkb by locally activated Torso. (c)–(e) Spatial distributions of Bcd (c), Cic (d), and nuclear Dl (e) gradients that provide spatially distributed inputs to the models shown in (a) and (b). (f) Bcd, Cic, and nuclear Dl gradients superimposed on the same embryo.
