Homozygotes do not eclose at 18 or 25oC. The survival rate to the pupal stage is 3% and 11% (at 25 and 18oC respectively). Ptp69D11 embryos show motor axon defects; 32% of ISNb axons, 7% of ISN axons, 8% of SNa axons and 1% of SNc axons show defects.