title: Comment on "Protein sequences from mastodon and Tyrannosaurus rex revealed by mass spectrometry".
abstract: 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 alpha1(I) collagen sequences with amphibians rather than birds suggest that T. rex does not.
authors.affiliation: BioArch, Departments of Biology, Archaeology, Chemistry and Technology Facility, University of York, Post Office Box 373, York YO10 5YW, UK.
authors.forename: Mike
authors.initials: M
authors.lastname: Buckley
authors.forename: Angela
authors.initials: A
authors.lastname: Walker
authors.forename: Simon Y W
authors.initials: SY
authors.lastname: Ho
authors.forename: Yue
authors.initials: Y
authors.lastname: Yang
authors.forename: Colin
authors.initials: C
authors.lastname: Smith
authors.forename: Peter
authors.initials: P
authors.lastname: Ashton
authors.forename: Jane Thomas
authors.initials: JT
authors.lastname: Oates
authors.forename: Enrico
authors.initials: E
authors.lastname: Cappellini
authors.forename: Hannah
authors.initials: H
authors.lastname: Koon
authors.forename: Kirsty
authors.initials: K
authors.lastname: Penkman
authors.forename: Ben
authors.initials: B
authors.lastname: Elsworth
authors.forename: Dave
authors.initials: D
authors.lastname: Ashford
authors.forename: Caroline
authors.initials: C
authors.lastname: Solazzo
authors.forename: Phillip
authors.initials: P
authors.lastname: Andrews
authors.forename: John
authors.initials: J
authors.lastname: Strahler
authors.forename: Beth
authors.initials: B
authors.lastname: Shapiro
authors.forename: Peggy
authors.initials: P
authors.lastname: Ostrom
authors.forename: Hasand
authors.initials: H
authors.lastname: Gandhi
authors.forename: Webb
authors.initials: W
authors.lastname: Miller
authors.forename: Brian
authors.initials: B
authors.lastname: Raney
authors.forename: Maria Ines
authors.initials: MI
authors.lastname: Zylber
authors.forename: M Thomas P
authors.initials: MT
authors.lastname: Gilbert
authors.forename: Richard V
authors.initials: RV
authors.lastname: Prigodich
authors.forename: Michael
authors.initials: M
authors.lastname: Ryan
authors.forename: Kenneth F
authors.initials: KF
authors.lastname: Rijsdijk
authors.forename: Anwar
authors.initials: A
authors.lastname: Janoo
authors.forename: Matthew J
authors.initials: MJ
authors.lastname: Collins
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001842:Bone and Bones / Q000737:chemistry*; D003094:Collagen / Q000737:chemistry*; D025061:Dinosaurs; D004606:Elephants; D005580:Fossils; D013058:Mass Spectrometry; D010802:Phylogeny
chemical_list: D003094:Collagen