Lampreys, the jawless vertebrates, contain only two ParaHox gene clusters.
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Proc Natl Acad Sci U S A. 2017 Aug 22;114(34):9146-9151. doi: 10.1073/pnas.1704457114. Epub 2017 Aug 7.
Proc Natl Acad Sci U S A. 2017.
PMID: 28784804
Free PMC article.