| Leiming Yin Doushantuo embryos preserved inside diapause egg cystsLeiming Yin State Key Laboratory of Paleobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China Nature 446:661-3. 2007 Ultrastructural and geochemical characterization of Archean-Paleoproterozoic graphite particles: implications for recognizing traces of life in highly metamorphosed rocksJames D Schiffbauer Department of Geosciences, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA Astrobiology 7:684-704. 2007
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