Imprecise excision of the P{lacW}Rpt1k11110 progenitor insertion. 32bp of residual P-element sequence remains.
The residual P{?lacW}Rpt1P65 insertion is within Rpt1, which is located within a long intron of CG17985, thus the residual insertion may affect the expression of both genes. Homozygosity for the P{?lacW}Rpt1P65 chromosome results in pupal lethality.