At 25oC, the survival rates of homozygotes are: adult survival - 0%, eclosion - 0%, pupation 23%. At 18oC, the survival rates of homozygotes are: adult survival - 0%, eclosion - 0%, pupation 17%. Ptp69D6 embryos show motor axon defects; 23% of ISNb axons, 5% of ISN axons, 6% of SNa axons and 5% of SNc axons show defects.