Complex rearrangement removing the 5' exon common to all splice forms of sty.
lethal - all die before end of pupal stage | recessive
some die during pupal stage | recessive
embryonic/larval dorsal tracheal branch
embryonic/larval ganglionic tracheal branch
Pupal lethal when hemizygous. The number of tracheal branches emanating from the dorsal and ganglionic branches is higher than normal in homozygous embryos.