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Fig. 1. The Drosophila bcd 3'UTR contains conserved NRE sequences. Diagram of bcd and hb 3'UTRs with size bar (top). NREs with conserved A and B boxes (hatched areas) and spacers (intervening gray areas). The bcd 3'UTR contains a bipartite NRE sequence and a downstream B box (1 1/2 NREs). Sequence alignment of the bcd and hb NRE regions (below) with conserved nucleotides (capitalized) and identical residues (*). Sequence names are the species with a bcd or hb prefix. Sequences in the EMBL/GenBank database: bcd, X14458, M32121, M32124, M32123, X55735, X78058, M32122, M32126, M3125; hb, Y00274, AJ00535, AJ00536, AJ00534, X15359. Numbers are the first nucleotide aligned in their database entry.