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In wild-type roses (a), the petal/stamen boundary is very stable, as all wild species have 5 petals. In cultivated roses, the petals/stamens boundary is labile within the flowers. Breeders have tinkered with this instability of petals/stamens boundary by acting on expression domain of the rose ortholog of AGAMOUS, all along breeding history to select either for semi-double flowers (b) or double flowers (c).
