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Drosophila embryo polarity - bicoid mRNA

Dr Daniel St. Johnston
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Credit: Drosophila embryo polarity - bicoid mRNA. Credit: Dr Daniel St. Johnston. Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)

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The localisation of bicoid mRNA in the Drosophila oocyte defines the anterior-posterior axis of the embryo. The image shows in situ hybridisation to bicoid mRNA in stage 10 Drosophila egg chamber. The egg chamber consists of 15 nurse cells and a large oocyte (right), which is surrounded by a layer of somatic follicle cells. Bicoid mRNA localises to anterior of the oocyte, directing where head and thorax of the embryo develop.


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