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From the same journal

Comment on "Protein Sequences from Mastodon and Tyrannosaurus rex revealed by Mass Spectrometry"

Research output: Contribution to journalComment/debatepeer-review


  • Mike Buckley
  • Angela Walker
  • Simon Y. W. Ho
  • Colin Smith
  • Peter Ashton
  • Enrico Cappellini
  • Hannah Koon
  • Ben Elsworth
  • Dave Ashford
  • Phillip Andrews
  • John Strahler
  • Beth Shapiro
  • Peggy Ostrom
  • Hasand Gandhi
  • Webb Miller
  • Brian Raney
  • Maria Ines Zylber
  • M. Thomas P. Gilbert
  • Richard V. Prigodich
  • Michael Ryan
  • Kenneth F. Rijsdijk
  • Anwar Janoo


Publication details

DatePublished - 4 Jan 2008
Issue number5859
Number of pages3
Pages (from-to)33
Original languageEnglish


We used authentication tests developed for ancient DNA to evaluate claims by Asara et al. (Reports, 13 April 2007, p. 280) of collagen peptide sequences recovered from mastodon and Tyrannosaurus rex fossils. Although the mastodon samples pass these tests, absence of amino acid composition data, lack of evidence for peptide deamidation, and association of α1(I) collagen sequences with amphibians rather than birds suggest that T. rex does not.

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