The first persuasive evidence that this happened comes from a study of dinosaur teeth from Camarasaurus, one of the most common species of sauropod. (newscientist.com)
And Capellini has agreed to analyze samples of dinosaur teeth in parallel with her lab, which might offer independent support for her claim that proteins can survive deep time. (sciencemag.org)
Thousands of fossilized semionotid fish (pdf)(ray - finned fish extinct since the Cretaceous) have been found in the area; their hard, enamel - coated scales would account for the wear found on dinosaur teeth recovered nearby. (discovermagazine.com)