Dinosaur blood proteins confirmed in 115-million-year-old fossil
Researchers used mass spectrometry, Raman spectroscopy, and electron microscopy to identify intact heme B tetrapyrroles and mineralised red blood cell structures inside the bone of a 115-million-year-old theropod, stabilised by manganese oxide encapsulation — the first chemically confirmed evidence that labile biological molecules can survive on geological timescales.
- Heme B identified by HPLC-MS; RBC microstructures confirmed by TEM in vascular channels
- Preservation mechanism: hausmannite (Mn3O4) micro-encapsulation within mineralised matrix
- Opens a path to paleophysiological studies of ancient oxygen transport and vertebrate metabolism