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Two-domain expression patterns of tll and hkb. (a) Locally activated Torso signaling induces tll and hkb through relief of Cic-mediated repression. (b) and (c) Spatial patterns of tll (b) and hkb (c) mRNAs in wild-type embryos. (d) and (e) Expression patterns of tll (d) and hkb (e) in embryos that lack Bcd (bcd[6]). (f) and (g) Expression patterns of tll (f) and hkb (g) in embryos that lack Trunk (trk[1]), which is a ligand for Torso.
