In early embryo, persistence of pair-rule-type expression pattern, with highest levels of expression in parasegments 6, 8, 10, 12. Weak EcollacZ expression in the odd parasegments; weak ectopic expression in parasegment 4. Ectopic expression in head and tail regions.Expression in the visceral mesoderm of parasegment 7 resembles wild-type Ubx expression.In embryo, many differences in relative levels of expression, compared to pattern of wild-type Ubx expression. In late embryos, this is especially noticeable in patterns of expression in the CNS.In third instar larvae, weak and variable expression in all imaginal discs.
Presence of trx is not able to maintain long term Ubx expression.