Starting with plasmid pWHL, a 850bp fragment of the βTub56D gene intron was cloned upstream of a truncated heat shock promoter in front of a lacZ reporter gene at a unique StuI site in the multiple cloning site.
EcollacZβTub56D.AS3 reporter gene expression is not observed before embryonic stage 14 and is observed in the intersegmental and intrasegmental apodemes. Expression in the embryonic/larval A1-7 pleural external apodeme ('petapo' or pet apodemes) is stronger than that of EcollacZβTub56D.AS2.