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regulatory sequences drive expression of a chimeric protein in which the Pvr extracellular ligand-binding domain has been replaced by the dimerization domain of the bacteriophage λ cI repressor (to induce constitutive dimerization of the encoded protein).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, 9 Tyr residues in the Pvr intracellular domain have been mutated to non-phosphorylatable Phe residues (amino acid replacements Y1264F, Y1271F, Y1278F, Y1286F, Y1303F, Y1321F, Y1428F, Y1451F and Y1486F).
Migration of border cells is less severely impaired in PvrYFa.Scer\UAS.T:λ\cI-DD,T:Hsap\MYC; Scer\GAL4slbo.2.6 animals than in Pvrλ.Scer\UAS.T:Hsap\MYC; Scer\GAL4slbo.2.6 animals.