Figure 4: Dynamic changes in gap expression domain widths.

(a) Shown is a schematic diagram of an expression domain illustrating the definition of its width (W), the direction of its movement during nc14, and a depiction of its leading and trailing boundaries. (b–f) Shown are differences in domain widths (expressed as values relative to embryo length) between large and small embryos as a function of time. Shaded band for each panel represents s.d. of ΔW.