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lacZ reporter expression is driven by a fragment of the hb upstream region, that only carries the sequences for one high affinity bcd binding sites, and the hb transcription start site.
In early embryos, β-gal signal is very weak. At gastrulation, a weak stripe of expression observed in the head region; believed to be artifactual (see expression data for EcollacZC4.Adh, carried on the P{CaSpeR-AUG-βgal} construct).