Other researchers might find similarly preserved soft tissues if they split open the bones in their collections, said Horner, a co-author of the paper.
Most museums, he said, prefer to keep their specimens intact.
Ok, i was completely wrong. The bone structure itself seems to be a form of preservation.
The soft tissues were recovered from the thighbone of a T. rex, known as MOR 1125, that was found in a sandstone formation in Montana. The dinosaur was about 18 years old when it died.
The bone was broken when it was removed from the site. Schweitzer and her colleagues then analyzed the material inside the bone.
Even so, it
is difficult for soft tissue to survive 68 million years. Then again, it is stated that this is a rare find.