Fig. 4. The mutant phenotype sometimes appears non cell-autonomous. (A) A pair of mutant sectors (brackets) with some cells between showing a mild mutant phenotype. The boxed region is shown in higher magnification in B. The arrows indicate cells partially affected by surface ridges typical of mutant cells. (C) Light and (D) fluorescence micrographs of a sector where a wild-type mesophyll cell is surrounded on 3 sides by mutant cells. The wildtype cell has a large spherical morphology not typical of normal mesophyll cells. (E) Wild-type mesophyll cells (between arrows) subjacent to a mutant epidermal sector showed a mutant phenotype. Size bars 100 µm (A,C,D); 50 µm (B,E).