# Intact Biomolecules Discovered in 115-Million-Year-Old Dinosaur Fossils Researchers identify mineralized red blood cells and heme compounds in ancient theropod remains. - **Source:** [Popular Science](https://www.popsci.com) - **Published:** 2026-11-02 - **Topic:** [Business](https://brifing.si/c/business) - **Original article:** - **On Brifing:** https://brifing.si/s/da689dac-40e2-4637-8e18-e71b8de08fe4 ## Breakthrough in Molecular Paleontology Paleontologists have confirmed the presence of intact biomolecules and mineralized red blood cells within dinosaur fossils. Published in PNAS, this study identifies oxygen-carrying heme compounds in a 115-million-year-old specimen. This discovery fundamentally challenges long-held scientific assumptions that delicate biological structures cannot survive the immense pressures of deep geological time. ## The Aratasaurus museunacionali Specimen The evidence was extracted from the limb bones of a juvenile Aratasaurus museunacionali, a theropod discovered in 2008. Living during the Early Cretaceous period in present-day Brazil, this dinosaur measured over 10 feet long. Researchers believe the juvenile specimen would have grown significantly larger had it reached full biological maturity. ## Chemical Preservation Mechanisms Researchers identified mineralized red blood cell components alongside a complex manganese oxide known as hausmannite. This specific mineral acted as a stabilizing agent, maintaining the structural integrity of heme molecules. Hausmannite also facilitated the preservation of additional biomolecules, including amino acids found in collagen, within the ancient fossilized bone matrix. ## Environmental Conditions for Fossilization The study authors theorize that this exceptional level of preservation required a very specific taphonomic environment. The specimen likely underwent rapid burial in a location that was rich in microbial activity but simultaneously low in oxygen. These conditions prevented rapid decay, allowing the delicate cellular structures to remain intact for millions. ## Challenging Scientific Dogma Co-author Kliti Grice from Curtin University emphasized that these findings overturn established beliefs regarding hemoglobin survival. Previously, the scientific community widely assumed that such complex biomolecules would inevitably degrade over millions of years. This evidence forces a re-evaluation of how organic materials interact with mineral environments during the fossilization process. ## Advancing Metabolic Research This discovery provides new avenues for studying dinosaur metabolism and ancient activity levels through molecular analysis. By examining these preserved components, scientists can gain deeper insights into the physiological evolution of prehistoric animals. The ability to analyze these molecules offers a direct window into the biological functions of extinct species. ## Implications for Astrobiology The researchers suggest that if delicate biomolecules can survive in harsh terrestrial environments, similar traces of life might exist elsewhere in the universe. This finding expands the scope of molecular paleontology, suggesting that biosignatures could be more resilient than previously thought. It provides a new framework for identifying potential life markers. ## Future Research Directions The identification of heme in this theropod sets a new precedent for future fossil examinations. Scientists will likely apply these chemical identification techniques to other ancient specimens to determine if such preservation is a recurring phenomenon. This work marks a significant shift in how paleontologists approach the study of ancient life. ## Sources covering this story - https://www.popsci.com/science/first-dinosaur-blood-fossil-discovery/ — --- _Summary written by Brifing from the original reporting. Copyright in the original article belongs to its publisher; read the full piece at the link above._