UAS regulatory sequences drive expression of a chimeric protein in which the Pvr extracellular ligand-binding domain has been replaced by the dimerization domain of the bacteriophage λ cI repressor (to induce constitutive dimerization of the encoded protein). A Tag:MYC epitope has been inserted at the junction of the λ and Pvr sequences. In addition, 14 Tyr residues in the Pvr intracellular domain have been mutated to non-phosphorylatable Phe residues (amino acid replacements Y985F, Y998F, Y1008F, Y1046F, Y1048F, Y1264F, Y1271F, Y1278F, Y1286F, Y1303F, Y1321F, Y1428F, Y1451F and Y1486F).
Migration of border cells is only mildly impaired in PvrYF14.Scer\UAS.T:λ\cI-DD,T:Hsap\MYC; Scer\GAL4slbo.2.6 animals.