Direct chemical evidence for eumelanin pigment from the Jurassic period

@article{Glass2012DirectCE,
  title={Direct chemical evidence for eumelanin pigment from the Jurassic period},
  author={Keely E Glass and Shosuke Ito and Philip R Wilby and Takayuki Sota and Atsushi Nakamura and Clifford R. Bowers and Jakob Vinther and Suryendu Dutta and Roger Everett Summons and Derek E. G. Briggs and Kazumasa Wakamatsu and John D. Simon},
  journal={Proceedings of the National Academy of Sciences},
  year={2012},
  volume={109},
  pages={10218 - 10223}
}
Melanin is a ubiquitous biological pigment found in bacteria, fungi, plants, and animals. It has a diverse range of ecological and biochemical functions, including display, evasion, photoprotection, detoxification, and metal scavenging. To date, evidence of melanin in fossil organisms has relied entirely on indirect morphological and chemical analyses. Here, we apply direct chemical techniques to categorically demonstrate the preservation of eumelanin in two > 160 Ma Jurassic cephalopod ink… 

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