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A battery of transcription factors collectively called the retinal determination RD network controls the earliest steps in the specification of the fruit fly compound eye. Write a review Rate this item: A Wild type first instar eye-antennal disc. During the second larval instar, both Toy and Tsh proteins are restricted to the retinal progenitor zone ahead of the advancing morphogenetic furrow Fig 7A—7C [ 14 , 22 , 24 ]. As many other precursor fields in both flies and vertebrates are parceled out to produce multiple distinct organs, it is likely that similar mechanisms are in place to ensure the fidelity of growth, specification, and patterning.
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The deep penile Buck fascia is a strong, deep, fascial layer that is immediately superficial to the tunica albuginea. Schematic drawing of the ey LB allele. It is continuous with the deep fascia of the muscles covering the crura and bulb of the penis, the ischiocavernosus and bulbospongiosus. Since DE-GAL4 drives expression only in the dorsal compartment later in development, we can use EdU staining and PH3 to look at potential differences in S phase and M phase populations within the dorsal mutant and ventral wild type compartments. Randhawa, G Coping with grieving making a request principles for staff relatives and for organs:
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Permissions Request Permissions View permissions information for this article. This test can help identify the cause of erectile dysfunction. An abnormal curvature of the shaft of the penis may be caused by injury of the adult penis or other medical conditions. Please obey the copyright laws of your country. Pet and smoke free home. Blood fills this tissue to cause an erection. Journals with no new volumes being added to the archive.
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After the initial growth phase, tsh expression is restricted to the eye field. B,C,F,G However, there are only slight differences in the percentage of cells that are in either S or M phases of the cell cycle. Edit Article Add New Article. Therefore, it is not clear how tissue fates are allocated if GRNs are uniformly expressed and competing with each other within the same populations of cells to activate and repress different fates? Eye-antennal imaginal discs were dissected at specific time points after the temperature shift or from third instar larvae. An abnormally small penis, present from birth.
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