Additional file 1.
Gene structures of cetacean Hr (A) and FGF5 (B). The exons are shown in black boxes and intron sizes shown in the figure are not proportionally scaled on both (A) and (B) because of the large size of the introns.
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Chen et al. BMC Evolutionary Biology 2013 13:34 doi:10.1186/1471-2148-13-34