Fig. 2. Minimal promoter for specific expression of As-T2 in two embryonic regions (muscle and the tip of the tail) of Halocynthia embryos. (A) Various deletion constructs examined to determine essential flanking sequences. (B) Frequency of embryos with the reporter gene expression and embryonic regions of expression. Numbers in graphs indicate the number of positive embryos. The deletion constructs indicated at the bottom are the same as those in A.