zeste, a nonessential gene, potently activates Ultrabithorax transcription in the Drosophila embryo.

Abstract excerpt

The GAGA, NTF-1, and zeste proteins have been purified previously from Drosophila embryo extracts and shown to activate the Ultrabithorax (Ubx) promoter in vitro. Here, differently mutated Ubx-promoter constructs containing binding sites for none, one, or all three of these transcription factors have been introduced into Drosophila by P-element transformation. Binding sites for each factor activate dramatically...

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