The bcdT:EcollacZtranscript is localized and accumulates at the anterior cortex of the oocytevery early on during oogenesis. As oogenesis proceeds, the transcript continuesto accumulate and little or no diffusion of signal is observed. In the earlyembryo the transcript remains localized anteriorly, reaching up to 20% egglength.
Eggs laid by homozygous Sry-δSF2 escaper females develop into embryos which have cuticles with a strong bcd-like phenotype, showing deletion of anterior structures and thoracic segments and duplication of the posterior telson. This phenotype is not significantly altered by bcdT:Ecol\lacZ.