Figure 2.

Embryonic and larval phenotypes of hsc4^54.1. (A) ABD-B staining of a stage 14 embryo obtained from crossing the ru hsc4^54.1 sr e and ru h th st cu hsc4^54.1 stocks. The embryo was cut open along the dorsal midline and flattened. Note the ectopic expression of ABD-B, especially in the central nervous system, up through the second thoracic segment, or parasegment 4 (arrowhead). A bracket marks parasegment 10, the anterior limit of ABD-B expression in wild-type embryos. (B) The ventral cuticle of a ru h th st cu hsc4^54.1/+ second instar larva. The denticle belts of the third, fourth, and fifth abdominal segments are marked. Most of the denticles of the fourth abdominal segment are missing (arrow).