Mutation in the extracellular domain.
Amino acid replacement: Q320term.
C11078889T
Q315term | sev-PA
Q320term
Site of nucleotide substitution in mutant inferred by FlyBase based on reported amino acid change.
Homozygous flies have wild-type ommatidia at 18oC, but only 1% of ommatidia have R7 cell rhabdomeres at 28oC.