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| - The system 130 may also include an intervertebral body material 134 which may be, for example, an injectable material such as polyvinyl alcohol (PVA) hydrogel, polyurethane, collagen, demineralized bone matrix, gelatin, polysaccharide, hyaluronic acid, keratin, albumin, silk, elastin, fibrin polymethylmethacrylate (PMMA), calcium phosphate, hyrdroxyapatite-tricalcium phosphate (HA-TCP) compounds,
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