Drosophila homeotic gene that is part of the bithorax complex> bithoraxcomplex. Mutations in Ubx affect parasegments 5-6, corresponding to the posterior thorax and anterior abdomen of the adult.
Ultrabithorax or Ubx is a member of the homeobox gene family. Homeobox proteins function as transcription factors. In Drosophila melanogaster it is expressed in the third thoracic (T3) and first abdominal (A1) segments and represses wing formation. The Ubx gene regulates the decisions regarding the number of wings and legs the adult flies will hav...Found on http://en.wikipedia.org/wiki/Ultrabithorax
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