brp regulatory and coding sequences (genomic fragment of ~50kb) in which the stop codon has been replaced by a single FRT site, a GFP tag, the 2A peptide and a lexA::VP16 driver sequence. The brp protein produced is constitutively tagged with GFP, and the presence of the 2A peptide allows the lexA::VP16 driver to be cotranslated as a separate protein, under the control of the brp regulatory sequences.