At 25oC, the survival rates of homozygotes are: adult survival - 1%, eclosion - 3%, pupation 8%. At 18oC, the survival rates of homozygotes are: adult survival - 0%, eclosion - 0%, pupation 12%. Ptp69D14 embryos show motor axon defects; 20% of ISNb axons, 3% of ISN axons, 7% of SNa axons and 5% of SNc axons show defects.