Figure 6.
Bru regulates osk activity (A–C) Larval cuticles; anterior is to the left. (A) Wild type; the arrow indicates cephalopharyngeal skeleton. (B) Embryo from a mother carrying transgene P[A7]; anterior expression of transgenic Osk causes defects in the head structures, which can be seen here as a reduction in the cephalopharyngeal skeleton (arrow). (C) Embryo from a mother carrying P[A7] and additionally heterozygous for aretQB72; the P[A7] phenotype is enhanced such that head structures are deleted and replaced with a mirror-image duplication of several abdominal segments. The arrowhead marks the axis of mirror-image duplication. Note that embryos from mothers heterozygous for aretQB72 alone do not show a mutant phenotype (data not shown).