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Theory Biosci
2007 Aug 01;1261:35-42. doi: 10.1007/s12064-007-0007-7.
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The mitochondrial DNA of Xenoturbella bocki: genomic architecture and phylogenetic analysis.
Perseke M
,
Hankeln T
,
Weich B
,
Fritzsch G
,
Stadler PF
,
Israelsson O
,
Bernhard D
,
Schlegel M
.
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The phylogenetic position of Xenoturbella bocki has been a matter of controversy since its description in 1949. We sequenced a second complete mitochondrial genome of this species and performed phylogenetic analyses based on the amino acid sequences of all 13 mitochondrial protein-coding genes and on its gene order. Our results confirm the deuterostome relationship of Xenoturbella. However, in contrast to a recently published study (Bourlat et al. in Nature 444:85-88, 2006), our data analysis suggests a more basal branching of Xenoturbella within the deuterostomes, rather than a sister-group relationship to the Ambulacraria (Hemichordata and Echinodermata).
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