lz intron II is fused upstream of a genomic fragment beginning at -1101bp from the start of the lz gene and containing the lz promoter, which is fused to a the full length lz cDNA.
The rescue of the lzr1 mutant eye phenotype by lzmF4 does not occur if the flies also carry aopACT.GMR; most ommatidial structure is lost in these flies.