Deletion breaking within the abd-A transcription unit between exons 2 and 4 (approximate coordinate 45-55kb) and within the Ubx transcription unit (approximate coordinate -10 to -55kb).
Cuticle preparations of embryos heterozygous with abd-AD24 show transformations of abdominal segments towards an A1 identity. Cuticle preparations of homozygous embryos show transformations towards a T3 identity.
abd-AJX2/Ubx embryos show a transformation of denticle belts towards T3 and die before hatching, but abd-AJX2/Ubxbx-34e animals live to adulthood and show no obvious transformation.