The virtues of gaps: xenarthran (Edentate) monophyly supported by a unique deletion in alpha A-crystallin.

@article{Dijk1999TheVO,
  title={The virtues of gaps: xenarthran (Edentate) monophyly supported by a unique deletion in alpha A-crystallin.},
  author={Meindert A van Dijk and Emmanuel Paradis and François M. Catzeflis and Wilfried W. de Jong},
  journal={Systematic biology},
  year={1999},
  volume={48 1},
  pages={94-106}
}
Shared insertions or deletions (indels) in protein-coding DNA can be strong indicators of the monophyly of a taxon. A three-amino acid deletion had previously been noted in the eye lens protein alpha A-crystallin of two species of sloths and two species of anteaters, which represent the Pilosa, one of the two infraorders of Xenarthra (Edentata). This deletion has not been observed in 55 species from 16 other eutherian orders, or in 2 species of marsupials, or in 34 nonmammalian vertebrates… CONTINUE READING