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CNN Arabic
Source: CNN Arabic
16 HrsCNN Arabic
Source: CNN Arabic
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Researchers observed oval structures resembling red blood cells, along with traces of heme—a component of hemoglobin—inside the fossilized shinbone of an *Aratasaurus* dinosaur that lived about 115 million years ago in northeastern Brazil. They said that combining microscopic imaging with chemical analysis made it possible, for the first time, to detect heme inside these structures. They linked their preservation to low oxygen levels in the burial environment and possibly to manganese oxides. But experts questioned whether the structures were truly red blood cells and stressed that finding heme does not mean DNA has survived. The team plans to examine other fossils to determine how common this kind of preservation is.
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