Researchers revise long-held theory of fruit-fly development

For decades, science texts have told a simple and straightforward story about a transcription factor that helps the embryo of the fruit fly, Drosophila melanogaster, pattern tissues in a manner that depends on the levels of this factor within individual cells. Now biologists have called that paradigm into question, revealing a tale that is both more complicated and potentially more interesting than the one previously described.

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