Fig. 5. Delta and Serrate expression are reduced in heph clones. Normal DL (A) and SER (D) expression in heph⁰³⁴²⁹ heterozygous wing discs. heph⁰³⁴²⁹ mosaic wing discs stained for DL (B,C) or SER (E,F) protein expression. The relative levels of DL and SER are reduced within heph⁰³⁴²⁹ clones (arrows). Although not dependent on proximity to the normal margin, this effect on DL and SER levels can be observed most clearly in cells flanking the boundary cells, where DL and SER expression is normally highest.