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. Author manuscript; available in PMC: 2009 Sep 1.
Published in final edited form as: Biosystems. 2008 Jun 8;93(3):250–255. doi: 10.1016/j.biosystems.2008.05.006

Fig. 1.

Fig. 1

(a) Diagram of Model 1 genetic regulatory network for eyespot focus determination falsified by Evans and Marcus (2006) because it failed to reproduce several known gene expression pattersn. Models of alternative regulatory network models that can reproduce these patterns are shown in (b) and (c). Genetic symbols: N—Notch, Dll—Distal-less, En—Engrailed, hh—hedgehog, Ptc—Patched, Ci—Cubitus interruptus, EcR—Ecdysone Receptor.