 The on-site findings from the 2005 campaign are currently cross-examined at the Romanian "Emil Racoviță" Institute of Speleology, Australian National University, (electron spin resonance and uranium-series dating on 21 bone/tooth samples and 29 associated sediment samples), University of Bristol, (uranium-series analysis on 22 bone samples), University of Bergen, (uranium-series dating on 7 samples), University of Oxford (AMS radiocarbon dating on 8 bone/tooth samples), Max Planck Institute (stable isotope analysis and ancient DNA on 37 bone/tooth samples), University of Vienna (AMS radiocarbon dating on 25 bone/tooth samples).A skull found in Peștera cu Oase in 2004/5 bears features of both modern humans and Neanderthals.According to a paper by Erik Trinkaus and others, published in the Proceedings of the National Academy of Sciences in January, 2007, this finding suggests that the two groups interbred thousands of years ago.