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Schematic representations of herg1, herg1b, herg1USO, and herg1bUSO cDNAs. Some structural features are also indicated. herg1 and herg1USO sequences are identical up to nucleotide (nt) 2399, while herg1b and herg1bUSO sequences are identical up to nt 1379 (both indicated by arrowheads). Boxed numbers indicate the number of exons relative to the herg1 gene.
