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a A diagram of the PCV region between L4 and L5 during pupal wing development. b Wild-type wing. c Loss of cv-2 leads to no PCV formation. d Excess cv-2 blocks PCV formation. e The model network for Cv-2 interactions. f A typical output with kinetic parameters for Gbb leads to a biphasic dependence on the amount of Cv-2 present. From Serpe et al. (2008) with permission
