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Oxytropidoceras posted a topic in Fossil NewsSingle-celled eukaryote fossil with evidence of mineralizing found in Yukon by Bob Yirka, June 29, 2017 https://phys.org/news/2017-06-single-celled-eukaryote-fossil-evidence-mineralizing.html Precursor of teeth and bones discovered in 810-million-year old fossils. Single-celled fossils found in Canada show the earliest evidence of a tissue-hardening process known as biomineralisation, writes Andrew Masterson, Cosmos. https://cosmosmagazine.com/palaeontology/precursor-of-teeth-and-bones-discovered-in-810-million-year-old-fossils The paper is: Cohen, P. A., J. V. Strauss, A. D. Rooney, M. Sharma, and N. Tosca, 2017, Controlled hydroxyapatite biomineralization in an ~810 million-year-old unicellular eukaryote. Science Advances. Vol. 3, no. 6, e1700095. DOI: 10.1126/sciadv.1700095 http://advances.sciencemag.org/content/3/6/e1700095.full Yours, Paul H.