Fig. 10. Schematic representation of evolution of gene interactions in the Antirrhinum lineage controlling flower dorsoventral asymmetry. Potential direct and indirect targets of CYC are highlighted in orange and red, with the subset of actual targets indicated in orange. Downstream targets regulating growth are in green and the rest of the regulatory network in which CYC interactions are embedded is shown in grey. Steps where divergence involving CYC interactions are lettered a-d (see text for explanation).