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. 2015 Oct 6;5:14864. doi: 10.1038/srep14864

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Copyright © 2015, Macmillan Publishers Limited

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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(A) Photograph of part of MCCMLH31444 indicating the region (asterisk) where the EDAX analysis was performed (over the remains of connective tissue). (B) EDAX profile of matrix, primarily showing a high abundance of Ca as expected for a limestone locality. (C) EDAX profile of feathers (purple profile) and connective tissues (brownish). Feathers are composed by higher concentrations of K, O, S, C and Fe as well as traces of Ti; connective tissues show a remarkably different composition from both the matrix and the fossil feathers, with a much more flat profile and a higher peak of P and Ca, evidencing the underlying calcium phosphatization process. One sample was collected from each region.