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The esterases of Drosophila: I. The anodal esterases and their possible role in eclosion

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Abstract

The ontogeny of esterase activity was analyzed electrophoretically throughout the development of Drosophila pseudoobscura. The major adult enzyme form, Esterase 5, and several minor components, showed no important developmental variation. A group of several rapidly migrating (anodal) esterases, in contrast, accumulated maximum activity during late pupal stages, but was completely absent in newly emerged adults. This disappearance was not the result of some rapid inactivation, for subsequent to eclosion these enzymatic forms could be fully recovered from the discarded pupal case. Of the four additional Drosophila species examined, all but one displayed a similar pattern of ontogenesis. The possible role of these pupa-specific esterases is discussed.

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Supported in part by U.S. Public Health Service Grant No. GM18910 to E.B.

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