In 2007, Dinosauria's paleontologists uncovered an unusually complete allosaurus in the Dana Quarry, which proved even more unusual in the laboratory: As the head was chipped from the matrix, a stegosaurus leg bone was found with it.

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Macchiarini performed the nine-hour operation on April 9 at the Children's Hospital of Illinois after carefully creating the windpipe using stem cells from Hannah's bone marrow that were saturated over a matrix of plastic fibers shaped into a tube.

CNN: Toddler gets new windpipe from her own stem cells