Imprecise excision of the progenitor insertion.
Chro8c/Chro1a, east1 has partially lethal - majority die | pharate adult stage phenotype
Chro8c/Chro1a, east1 has flightless phenotype
Chro71/Chro8c has neuroblast | third instar larval stage phenotype, suppressible | partially by pros[+]/pros17