FIG 8.

Variation in 3′UTR reactivity corresponds to distinct models of secondary structure. SHAPE informed secondary structure models of the 5′ ends of the (A) duplication, (B) canonical, and (C) deletion 3′UTRs are shown. Secondary structure models are for the (1+2) repeat element region for each 3′UTR where the duplication and deletion events occurred. Nucleotides that pair with sequence not shown have been indicated by brackets and a note. In the duplication 3′UTR one stem-loop is indicated with connected brackets for clarity. Black boxes indicate two stem-loop motif that was duplicated. Nucleotides are colored according to SHAPE reactivity key in Fig. 1A.