Fig. 8. Comparison of hunchback mutant phenotypes. All embryos are stained with the FP6.87 antibody (Kelsh et al., 1994), which recognizes both Ultrabithorax (Ubx) and Abdominal-A (Abd-A) proteins. The embryos in A,B,D and E are segmented. The embryos in C and F are younger, at the age of onset of Ubx-Abd-A expression. (A) Wild-type Drosophila embryo. (B) Drosophila embryo lacking zygotic hunchback function. (C) Drosophila embryo lacking both maternal and zygotic hunchback function. (D) Wild-type Nasonia. (E) Nasonia hunchback^hl, segmented embryo. (F) Nasonia hunchback^hl as Hox gene expression is initiating, to ensure that no head rearrangements have yet taken place.