Ecdysone-induced changes in glycoprotein synthesis and puff activities in Drosophila virilis salivary glands

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Abstract
During five hours after the injection of α-ecdysone into the hemolymph of D. virilis late third instar larvae the formation of larval glycoproteins in the salivary glands is terminated and the synthesis of a different set of glycoproteins which is characteristic for the prepupal gland is initiated. The data presented suggest that products from early puffs inhibit the formation of larval glycoproteins while the induction of late puffs may be responsible for the appearance of prepupal glycoproteins.