Non-avian dinosaur eggshell calcite can contain ancient, endogenous amino acids

Evan T. Saitta; Jakob Vinther; Molly K. Crisp; Geoffrey D. Abbott; Lucy Wheeler; Samantha Presslee; Thomas G. Kaye; Ian Bull; Ian Fletcher; Xinqi Chen; Daniel Vidal; Fernando Sanguino; Ángela D. Buscalioni; Jorge Calvo; Paul C. Sereno; Stephanie L. Baumgart; Michael Pittman; Matthew J. Collins; Jorune Sakalauskaite; Meaghan Mackie; Federica Dal Bello; Marc R. Dickinson; Mark A. Stevenson; Paul Donohoe; Philipp R. Heck; Beatrice Demarchi; Kirsty E.H. Penkman