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In page Arabidopsis thaliana:

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Observations of homeotic mutations led to the formulation of the ABC model of flower development by E. Coen and E. Meyerowitz.[1] According to this model, floral organ identity genes are divided into three classes - class A genes (which affect sepals and petals), class B genes (which affect petals and stamens), and class C genes (which affect stamens and carpels). These genes code for transcription factors that combine to cause tissue specification in their respective regions during development. Although developed through study of A. thaliana flowers, this model is generally applicable to other flowering plants.[citation needed]