Deletion of 5' sequences to +174bp.
Deletion of 5' regulatory site at +174bp.
Deletion of 5' region and some untranslated leader region with the effect that the BgB enhancer is juxtaposed with position +173, 4bp before the AUG initiation codon.
Shows greater dosage compensation in X chromosomal than in autosomal sites.
Eye colour: dull red. Testis colour: colourless.
Protein fails to interact with Ufo1.