Researchers suggest ancient preserved circulatory and nervous systems in China are actually biofilms
(PHYSorg.com Archaeology & Fossils)

A small team of researchers from Germany and China has found evidence that suggests ancient preserved circulatory and nervous systems found in Chengjiang, China, are actually the remains of biofilms. In their paper published in Proceedings of the Royal Society B, the group describes their study of hundreds of fossils collected from the Chengjiang site and what they found.