The P{PZ}Cyt-c-dbln1 insertion maps within both the Cyt-c-d and CG31808 transcription units (overlapping genes). In Cyt-c-d, the insertion site is close to the boundary of the first exon and intron. FlyBase curator comment: FBrf0190354 demonstrates that the mutant phenotype of the P{PZ}Cyt-c-dbln1 insertion is caused by an effect on Cyt-c-d.