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The ABC model for flower development in angiosperms was formulated by E. Coen and E. Meyerowitz in 1991. This model is build on the observation of mutants with defects in floral organs development.The ABC model summarizes how the presence of different classes of transcription factors in the different parts of the flower regulates the development of floral organs. The class A genes are responsible for the development of sepals and together with class B genes of petal development, class B genes together with class C genes determines the development of stamen and class C genes alone are responsible for the development of carpels.