Saitta, E.T., Vinther, J., Crisp, M.K., Abbott, G.D., Kaye,
T.G., Pittman, M., Bull, I., Fletcher, I., Chen, X., Collins,
M.J. and Sakalauskaite, J., 2020. Non-avian dinosaur
eggshell calcite contains ancient, endogenous amino acids.
bioRxiv 2020.06.02.129999 preprint
doi: https://doi.org/10.1101/2020.06.02.129999
https://www.biorxiv.org/content/10.1101/2020.06.02.129999v1
https://www.researchgate.net/publication/341881580_NON-AVIAN_DINOSAUR_EGGSHELL_CALCITE_CONTAINS_ANCIENT_ENDOGENOUS_AMINO_ACIDS
https://www.researchgate.net/profile/Evan_Saitta
Free pdf:
https://www.biorxiv.org/content/10.1101/2020.06.02.129999v1.full.pdf
Yours,
Paul H.