Careful misleading headlines, What was actually found were fossilized remains of blood cells and NOT preserved blood cells, These discoveries rean fossilized remains even though the tissue remained soft.
Surprise discovery of bird-like blood cells in dinosaur bones suggests that fleshy remains might be commonplace even in poorly preserved fossils
www.newscientist.com
Instead, they found blood-like cells and collagen from 75-million-year-old dinosaur fossils – 10 million years before
T. rex appeared.
Although the cells are unlikely to contain DNA, those extracted from better preserved fossils using the same technique may do so, she says.
And even without DNA, soft tissue cells and molecules could help us learn much more about dinosaur physiology and behaviour, the team says. For example, the physical size of blood cells can reveal insights into metabolism, and the possible transition from a cold to warm-blooded existence.
So far, such
soft flesh tissues were only ever found in serendipitous fossils preserved in exceptionally rare circumstances, for example, by being frozen in ice or in a dry environment free of microbes that would otherwise break down the flesh, says Maidment.
Don't get your hopes up. What they found were actual fossils though uniquely protected from deterioration,