Insertion in the first intron of Ntan1.
Ntan1Mz97 homozygous third instar larvae present nerves with axonal defasciculation and clusters of several subperineurial glial cell nuclei, which is an indication of multi-nucleated cells, as compared to heterozygous controls; Ntan1Mz97/Df(2R)NtanΔ transheterozygous show similar defects.