Comment on

• Origin and evolution of the integumentary skeleton in non-tetrapod vertebrates.

  Sire JY, Donoghue PC, Vickaryous MK. Sire JY, et al. J Anat. 2009 Apr;214(4):409-40. doi: 10.1111/j.1469-7580.2009.01046.x. J Anat. 2009. PMID: 19422423 Free PMC article. Review.
• The integumentary skeleton of tetrapods: origin, evolution, and development.

  Vickaryous MK, Sire JY. Vickaryous MK, et al. J Anat. 2009 Apr;214(4):441-64. doi: 10.1111/j.1469-7580.2008.01043.x. J Anat. 2009. PMID: 19422424 Free PMC article. Review.
• Evolutionary and developmental origins of the vertebrate dentition.

  Huysseune A, Sire JY, Witten PE. Huysseune A, et al. J Anat. 2009 Apr;214(4):465-76. doi: 10.1111/j.1469-7580.2009.01053.x. J Anat. 2009. PMID: 19422425 Free PMC article. Review.
• Loss of teeth and enamel in tetrapods: fossil record, genetic data and morphological adaptations.

  Davit-Béal T, Tucker AS, Sire JY. Davit-Béal T, et al. J Anat. 2009 Apr;214(4):477-501. doi: 10.1111/j.1469-7580.2009.01060.x. J Anat. 2009. PMID: 19422426 Free PMC article. Review.
• Current knowledge of tooth development: patterning and mineralization of the murine dentition.

  Catón J, Tucker AS. Catón J, et al. J Anat. 2009 Apr;214(4):502-15. doi: 10.1111/j.1469-7580.2008.01014.x. J Anat. 2009. PMID: 19422427 Free PMC article. Review.
• Structure and functions of keratin proteins in simple, stratified, keratinized and cornified epithelia.

  Bragulla HH, Homberger DG. Bragulla HH, et al. J Anat. 2009 Apr;214(4):516-59. doi: 10.1111/j.1469-7580.2009.01066.x. J Anat. 2009. PMID: 19422428 Free PMC article. Review.
• Evolution of hard proteins in the sauropsid integument in relation to the cornification of skin derivatives in amniotes.

  Alibardi L, Dalla Valle L, Nardi A, Toni M. Alibardi L, et al. J Anat. 2009 Apr;214(4):560-86. doi: 10.1111/j.1469-7580.2009.01045.x. J Anat. 2009. PMID: 19422429 Free PMC article. Review.
• A new scenario for the evolutionary origin of hair, feather, and avian scales.

  Dhouailly D. Dhouailly D. J Anat. 2009 Apr;214(4):587-606. doi: 10.1111/j.1469-7580.2008.01041.x. J Anat. 2009. PMID: 19422430 Free PMC article. Review.
• The anatomy and development of the claws of Xenopus laevis (Lissamphibia: Anura) reveal alternate pathways of structural evolution in the integument of tetrapods.

  Maddin HC, Eckhart L, Jaeger K, Russell AP, Ghannadan M. Maddin HC, et al. J Anat. 2009 Apr;214(4):607-19. doi: 10.1111/j.1469-7580.2009.01052.x. J Anat. 2009. PMID: 19422431 Free PMC article.
• The structure of the cornified claw sheath in the domesticated cat (Felis catus): implications for the claw-shedding mechanism and the evolution of cornified digital end organs.

  Homberger DG, Ham K, Ogunbakin T, Bonin JA, Hopkins BA, Osborn ML, Hossain I, Barnett HA, Matthews KL 2nd, Butler LG, Bragulla HH. Homberger DG, et al. J Anat. 2009 Apr;214(4):620-43. doi: 10.1111/j.1469-7580.2009.01068.x. J Anat. 2009. PMID: 19422432 Free PMC article.