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2 Publications

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    12/03/93 | The TGF beta homolog dpp and the segment polarity gene hedgehog are required for propagation of a morphogenetic wave in the Drosophila retina.
    Heberlein U, Wolff T, Rubin GM
    Cell. 1993 Dec 3;75(5):913-26. doi: 10.1186/gb-2007-8-7-r145

    Development of the Drosophila retina occurs asynchronously; differentiation, its front marked by the morphogenetic furrow, progresses across the eye disc epithelium over a 2 day period. We have investigated the mechanism by which this front advances, and our results suggest that developing retinal cells drive the progression of morphogenesis utilizing the products of the hedgehog (hh) and decapentaplegic (dpp) genes. Analysis of hh and dpp genetic mosaics indicates that the products of these genes act as diffusible signals in this process. Expression of dpp in the morphogenetic furrow is closely correlated with the progression of the furrow under a variety of conditions. We show that hh, synthesized by differentiating cells, induces the expression of dpp, which appears to be a primary mediator of furrow movement.

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    12/01/93 | Nonfloral sources of chemicals that attract male euglossine bees (Apidae: Euglossini).
    Whitten WM, Young AM, Stern DL
    J Chem Ecol. 1993 Dec;19(12):3017-27. doi: 10.1007/BF00980599

    We present chemical analysis of four rotten or fungus-infected logs that attracted fragrance-collecting male euglossine bees. Eight of the 10 volatile compounds detected have never been found in the fragrances of orchids pollinated by male euglossine bees. Nonfloral sources of chemicals such as rotting wood may constitute an important fragrance resource for male bees. Since rotten logs produce large quantities of chemicals over long periods of time, such nonfloral sources might be more important than flowers as a source of certain fragrances for some euglossine bee species. Fragrance collecting in euglossine bees might have evolved originally in relation with rotting wood rather than flowers.

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