Fig. 1. Mapping of vri 5' end and generation of deletion alleles by P-element mutagenesis. The position of the vri alleles and the extent of the deletions generated are shown. The localization of the vri cDNAs, the other described loci, the putative GadFly genes and the BDGP cDNAs are presented. The positions of the genomic (1, 2, 3, 4) and PlacW primers used for PCR amplification are shown (arrows). vri1 (cDNA3.8) and vri2 (cDNA3.3) are the two types of cDNAs used for UAS constructs. DS00714 distal end of a P1 phage isolated by the BDGP, DM194B8, T7 end and DM77B6, SP6 end of two cosmids isolated by the European Drosophila Mapping Consortium.