GoKawiilFossilized red blood cells found in 115-million-year-old dinosaur bone
Researchers led by Kliti Grice at Curtin University examined hind leg bones of an Aratasaurus specimen housed at Brazil's National Museum, discovered in a mine in 2008. Using electron microscopy and chemical testing, they identified microscopic structures resembling red blood cells and traces of heme, the molecule behind hemoglobin, within the bone's vascular canals. The findings were published in Proceedings of the National Academy of Sciences.