Deletion removing N-terminal coding sequences, including the signal sequence and part of the first immunoglobulin domain. This enhanced phenotype is completely rescued by one copy of Ptp69D+t10.5.
Shows incompletely penetrant SNb (and, to a lesser extent, SNa) pathfinding defects. RP axons sometimes exhibit guidance errors within the CNS.
Ptp69D2 has larval abdominal segmental nerve phenotype, enhanceable by Ptp99A1
Rank order for penetrance of SNb mutant phenotypes is Ptp69D1 > Ptp69D2 > Ptp69D1/Ptp69D3 > Ptp69D3.