This minireview considers the possibility that there is a correlation between the slow rate of morphological change and speciation events that has been occurred within the lungfish lineage since the Permian period, and the apparent slow rate of divergence in the amino acid sequences of lungfish opioid precursor sequences. The status of lungfish as "living fossils" is considered.
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| http://dx.doi.org/10.1016/j.ygcen.2006.07.010 | DOI Listing |
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