Construct: Amino acid replacement: Y2546F.
Number of R7 cells per ommatidium is 0.03 +/- 0.04 (n=365).
The Y2546F mutation reduces the efficiency of signalling from sev in all cells that can adopt an R7 cell fate.
The Y2546F mutation reduces the efficiency of signalling from sev in all cells that can adopt an R7 cell fate.