Report
115-million-year-old dinosaur fossil may contain red blood cell remnants
Cell-like structures and chemical traces point to ancient blood, but paleontologist Mary Schweitzer disputes the identification.
TLDR
A dinosaur leg bone from Brazil may preserve 115-million-year-old red blood cell remnants. Kliti Grice’s team bases its identification on imaging and chemical signs of heme, a component of hemoglobin. Paleontologist Mary Schweitzer questions whether the chemical signals identify the individual structures, since they came from the whole bone. Grice argues that several lines of analysis together support the finding.
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