Ecdysone is a steroidal prohormone of the major insect molting hormone hydroxyecdysone , which is secreted from the prothoracic glands. Insect molting hormones ecdysone and its homologues are generally called ecdysteroids. Ecdysteroids act as moulting hormones of arthropods but also occur in other related phyla where they can play different roles. In Drosophila melanogaster , an increase in ecdysone concentration induces the expression of genes coding for proteins that the larva requires, and it causes chromosome puffs sites of high expression to form in polytene chromosomes.
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