Figure 6

Df(1)RK4 embryonic cuticular phenotype. In this mutation, the denticle belt is missing from the abdominal A4 segment (A), or is interrupted (B) (arrows). (C, D) In a large number of embryos, the phenotypical changes are more severe; for example, no denticle belts are formed; panel C: dorsal view. However, even in these severe cases, the mouth hook formation is not affected (panel D, ventral view).