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to the mouse forelimb, suggesting that expanded expression of fgf8 may contribute to the larger size of the bat forelimb. Because the mouse and bat orthologs are conserved, there is likely to be a regulatory change in fgf8. In mice, one gene known to regulate limb growth is prx1, which encodes a transcription factor. The expression patterns of prx1 in bats differs from mice in that prx1 has an expanded expression domain and is upregulated. Researchers found that the coding region of prx1 in bats is

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