At 25oC, the survival rates of homozygotes are: adult survival - 0%, eclosion - 2%, pupation 29%. At 18oC, the survival rates of homozygotes are: adult survival - 8%, eclosion - 16%, pupation 102%. Ptp69D22 embryos show motor axon defects; 28% of ISNb axons, 10% of ISN axons, 16% of SNa axons and 5% of SNc axons show defects. 9% of ISNb axons show a complete bypass phenotype and 10% show a partial bypass phenotype.