Scer\FRT-mediated recombination between the two progenitor insertions has resulted in the deletion of the genomic sequence between them.

Homozygous Df(3L)armi-J flies are viable but result in complete male and female sterility, and the females do not lay eggs. Germaria from Df(3L)armi-J mutant animals are disorganized and the ovarioles generally contain only one egg chamber with many more than the normal number of germline cells and a terminal filament, indicating that the cysts are not leaving the germarium. The germline nuclei are of different sizes and many egg chambers also exhibit nuclear changes indicative of cell death from three days onward. Ovaries from Df(3L)armi-J mutants that are over one week old contain ovarioles with disorganised germaria, no developing egg chambers and few visible nuclei. Examination of ring canals and oocyte number shows that multiple cysts are enclosed in a single follicular layer.

This deficiency has been used as a null allele for CycJ when in combination with armi^+t6.3 and armi when in combination with CycJ^+t4. The authors showed that the phenotypes seen in Df(3L)armi-J are not due to loss of CG14971.