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Normal and mutant homeotic gene action in Arabidopsis

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(a) A normal flower composed of four concentric whorls of structures: sepals, petals, stamens, and carpels. To the right is the ABC model of homeotic gene action in Arabidopsis. This is a revised model based on the recent identification of E genes. (b) A homeotic mutant defective in gene A in which the sepals have been transformed into carpels, and the petals have been transformed into stamens. (c) A triple mutant defective in the A, B, and C genes, producing a flower with all leaves.
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