“Traces of ancient blood found in 115 million-year-old dinosaur fossil, new study claims”

Key points

• Researchers report red blood cell-like structures and heme signatures in Aratasaurus museunacionali bones.
• Study analyzes limb bones from a roughly 10-foot-long theropod dating to Early Cretaceous.
• Chemical and microscopic analyses link structures to red blood cells and preserved heme.
• Experts question interpretation, noting the cells may not match non-mammalian RBCs and suggest further methods.
• Findings claim preservation possible due to rapid sediment burial in low-oxygen, microbial-mat environment.