Abstract
IN several insects the cells of the embryonic blastoderm have been shown to depend for their further development on a stimulus emanating from a ventral prothoracic differentiation centre1,2. In cyclorrhaphous Diptera a similar centre has so far escaped detection, although Yao3 has proposed one for Drosophila melanogaster on the basis that alkaline phosphatase activity is first detectable in the ventral prothoracic region during contraction of the germ band and spreads both anteriorly and posteriorly as histo-differentiation proceeds. Further results bearing on this question have now been obtained by the application of ligatures to the early embryos of Dacus tryoni (Diptera, Trypetidae (= Tephritidae.).
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References
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ANDERSON, D. A Differentiation Centre in the Embryo of Dacus tryoni . Nature 190, 560–561 (1961). https://doi.org/10.1038/190560a0
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DOI: https://doi.org/10.1038/190560a0
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