Imprecise excision of the P{EP}CG12974EP756 insertion, resulting in an 800bp deletion that remove the transcription start site and 143bp of the 5' UTR of Z4 and also part of the CG12974 transcription unit.
pzg1.3 is rescued by pzgTag:MYC
pzg1.3 is rescued by pzgUAS.cEa/Scer\GAL4T80
The lethal phenotype of the Df(3L)Z4-1.3 chromosome is rescued by the P{Z4myc} construct, which contains the complete Z4 gene, but not the complete CG12974 gene, suggesting that the lethality of the Df(3L)Z4-1.3 chromosome is due to an effect on the Z4 gene.