Imprecise excision of the progenitor insertion, resulting in deletion of two sona exons 5' to the insertion site.
lethal - all die before end of P-stage
visible (with sona13)
visible (with sona47)
interommatidial bristle (with sona13)
interommatidial bristle (with sona47)
sona18/sona47 as well as sona13/sona18 heterozygous adults have disoriented interommatidial bristles especially in the dorsal eye.