Direct chemical evidence for eumelanin pigment from the Jurassic period.
Glass K, Ito S, Wilby PR, Sota T, Nakamura A, Bowers CR, Vinther J, Dutta S, Summons R, Briggs DE, Wakamatsu K, Simon JD.
Glass K, et al. Among authors: bowers cr.
Proc Natl Acad Sci U S A. 2012 Jun 26;109(26):10218-23. doi: 10.1073/pnas.1118448109. Epub 2012 May 21.
Proc Natl Acad Sci U S A. 2012.
PMID: 22615359
Free PMC article.