Identification of chorion protein precursors and the mRNAs that encode them in Drosophila melanogaster.

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Abstract
Specific antisera were generated for major size classes of D. melanogaster chorion proteins. These antisera were used in conjunction with cell-free translation of follicular RNA to identify precursors, containing signal peptides, for chorion components A1, A2, B1 and B2. An additional precursor cross-reacts with anti-B antisera, although its product appears to correspond to a protein distinct from authentic B proteins. The size classes of mRNA encoding A and B protein precursors were identified by cell-free translations.