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The salivary glands and other tissues from Drosophila melanogaster were dissected at various times throughout the prepupal period, as well as after heat shocks and ecdysterone treatments, and the proteins labelled by incubating the isolated tissues with [35S]methionine were separated by electrophoresis on sodium dodecyl sulphate-polyacrylamide gel. The labelled band patterns from salivary gland, as seen on the autoradiograph of the gel, showed striking variations, in a manner remarkably similar to variations in puff patterns during the same prepupal period. In proteins from Malpighian tubes, the pattern of bands varied to a lesser extent and in brain only a few components were modified. Heat shock brought about the appearance of a number of new bands, while others were reduced in intensity. This effect was observed with all the tissues examined, salivary glands, brain and Malpighian tubes, as well as wing imaginal discs, tissue lacking polytene chromosomes. The six most heavily labelled bands induced by heat shock represent about 30%, and one component alone represents over 15%, of the total label in the sample, as seen in salivary glands, brain and Malpighian tubes. The synthesis of RNA at puff sites was investigated after heat shock by [3H]uridine labelling. By correlating the amount of [3H]uridine in some puffs with the level of [35S]methionine in some bands a tentative relation is suggested in a few instances.
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