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retained in the genomes of snakes. Certain limb-enhancer sequences are also conserved between different types of appendage, such as limbs and the phallus. For instance, limb-development signalling plays a role both in the development of the limbs and of the genital tubercle in mice. The study of limb reduction and limb loss is unravelling the genetic pathways that control limb development. The Turing system has enabled a number of possible outcomes in the evolutionary

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