Fig. 3. skd kto double mutants have the same phenotype as either single mutant. (A-F) Third instar eye discs. Wild-type tissue is labeled with X-gal staining, revealing arm-lacZ expression (A-D), or with GFP (green; F). (A-C) Elav-stained photoreceptors (brown). (A) skd^T616 clones, (B) kto^T241 clones, and (C) skd^T606, kto^T241 clones. Few Elav-stained photoreceptors form at the posterior of all clones, although cell growth and survival are unaffected. (D-F) Atonal staining of kto^T314 clones (brown; D) or skd^T606, kto^T241 clones (red; E,F). Ato is inappropriately maintained posterior to its normal domain in single- or double-mutant clones. (G-I) Third instar wing discs with skd^T606, kto^T241 clones. Wild-type tissue is labeled with GFP (green; I). Ci is stained red (G,I) and Wg blue (H,I). Double-mutant clones cross the AP compartment boundary (white dashed line in I) and distort the DV boundary (arrow; H). Ci and Wg are expressed at normal levels within the mutant tissue.