MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY
Bone biopsy samples arrayed next to a ruler. The samples are encased in a clear plastic called PMMA (polymethyl methacrylate), which is also used as a bone cement. Biopsies are tissue samples obtained for microscopic analysis to aid a diagnosis of the patient's condition. Photographed at the Rizzoli Institute, Bologna, Italy.
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