The flanking sequences in the 'l(3)j2E11' line map to unique sites in the genome 25.7 kb apart. The 3' flank (AQ026309) maps to within the CG6833 gene and the 5' flank (AQ034129) maps to within the btl gene. Complementation data in FBrf0111489
(the l(3)j2E11 line fails to complement btl00208
) is consistent with there being an insertion in the btl gene in the 'l(3)j2E11' insertion line.