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Fig. 4. Phenotype of the phmyb1 mutant from Petunia
hybrida. (A) Petals show darker revertant sectors (white
arrow) distinguishable from a paler background of mutant cells. (B)
Micrographs of the inner epidermis of an unstable phmyb1 line showing
a revertant sector (the boxed region in A). Mutant cells and wild-type
revertant cells have different shapes. Scale bar: 100 µm.