Abstract
The evagination of imaginal leg discs to produce legs is a useful model for studying morphogenesis. Evagination of imaginal leg discs occurs in vitro in defined culture media in the presence of the molting hormone β-ecdysone. Evagination involves limited, organized movement of imaginal disc cells. The movement appears to be a result of contractile activity, coordinated with the presence of appropriate structural and surface properties of disc cells. However, ecdysone does not produce its effects directly, but acts through the genome to cause evagination. Evagination is a result then of increased synthesis of different proteins, one of which is myosin. If the results on discs are generalizable they indicate that similar morphogenetic processes are the direct result of the readout of the specific genetic programs.
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