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Sue the T. rex is intact again, and scientists suspect they know a little more about how the animal functioned. Those little “arms”? Little used.

The right forelimb of the Field Museum’s prize specimen was removed last week for ultra-high-power X-ray analysis over the weekend at Argonne National Laboratory.

Scientists wanted to study the appendage, disproportionately small to the T. rex body, to try to determine how much activity it saw. The question of the purpose of T. rex forelimbs is one of the ongoing mysteries in dinosaur paleontology.

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The “very preliminary” result, according to Carmen Soriano, the Argonne paleontologist who ran the machine? “We saw that the bones had some empty spaces, so that might show that the bones were not much used,” she said.

The cautious nature of scientific study and publication means it will be months or even years before the findings make their way into a peer-reviewed paper.

But Pete Makovicky, the Field’s associate curator of dinosaurs, said in a statement, “There aren’t many signs of stress on the bones that would indicate frequent use. Based on what we know now, it looks like T. rex didn’t use its arms much, at least not as an adult.”

“But,” he cautioned, “there’s a lot still to learn.”

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