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(a) Antirrhinum flower shown in side view (Left) or face view (Right). Regions are color coded as blue (dorsal), brown (lateral), and yellow (ventral). The dorsal half of the dorsal petal is shown in darker blue [reproduced with permission from ref. 60 (Copyright 2003, Nature Publishing Group, www.nature.com).] (b–d) Flattened petal lobes of wild-type (b), cyc dich double mutant (c), and mutant expressing CYC ectopically (d).
