UASt regulatory sequences drive expression of a chimeric protein in which amino acid residues 70-260 of nrv2 (part of the extracellular domain) replace the corresponding portion of nrv3.
nrv2::nrv3Nrv2ABC.UAS/Scer\GAL4da.G32 is a non-suppressor of presumptive embryonic/larval tracheal system phenotype of nrv223B