Fig. 2. faf⁺ functions in R2/3/4/5. (A,B) Confocal images of GFP expression from a RO-GFP transgene in an eye disc. In A, anterior is towards the right and the arrow indicates the position of the furrow. (B) An enlargement of part of A is shown, the numbers indicating R-cells R2/3/4/5. (C,D) Tabulation of the different phenotypically mutant faf⁺/faf^FO8 mosaic facets with one (C) or two (D) ectopic R-cells are shown. (E) Tabulation of the different phenotypically wild-type faf⁺/faf^BX4 mosaic ommatidia are shown. Numbers beneath each diagram refer to the number of facets with that particular mosaic pattern observed. The faf⁺ R-cells are white⁺ (have pigment granules) and the faf^- R-cells are white^- (do not have pigment granules). (F) Aspects of the data in C-E are displayed graphically. Scale bar: 20 µm in A; 10 µm in B.