GMR regulatory sequences drive expression of the Ptp69D coding region.
wild-type
Ptp69D is not sufficient to retarget R8 axons in the lamina, nor to respecify R7 connections.
Ptp69DGMR.PG rescues Ptp69D1
Fully rescues the R1-R6 targeting phenotype in Ptp69D1/Df(3L)8ex34 larvae.