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Bone screw. Coloured Scanning Electron Micrograph (SEM) of a screw used in orthopaedic surgery to help repair broken bones, in this case in the spinal column. Surgeons may use implants, such as screws, pins, nails, bolts and nuts, to hold the bone fragments together until they can bond again. The screw's design has been optimized to withstand the stresses that will be imposed upon it when it is implanted. Magnification: x20 at 6x6cm size.
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