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Comparison of material properties in unconfined compression. NP nucleus pulposus, A–C three experimental hyaluronic acid-based hydrogels, alg 2.0% medium viscosity alginate, aga 2.0% med viscosity agarose. a Toe modulus calculated at 0% strain, b linear region modulus calculated at 20% strain, c Poisson’s ratio, d relaxation (%) *significantly different than human NP (P < 0.05)
