FIG. 4.

Sampling of integrated mRNA and Giant data. lacZ reporter constructs were introduced into Drosophila by germline transformation and mRNA detected by fluorescent imaging. Dorsal and Twist activators drive lacZ gene expression in ventral regions (A). When regulated by Giant, gaps in this pattern are evident (B). A sampling mesh is imposed upon the background-subtracted image, and values for Giant and lacZ are collected (C, D). The mesh size here is exaggerated for clarity. Sampling proceeds from anterior region of anterior stripe to posterior region of posterior stripe.