Df(2L)PJ17 breaks at the 4th amino acid of the La coding region and in the first exon of spir removing almost the entire coding regions for both genes. Df(2L)PJ17 has a breakpoint at the fourth amino acid of La, removing almost all of its coding region.
The three midgut constrictions that normally occur in wild-type are missing in homozygous Df(2L)PJ17 embryos.