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Measurement of biochemical content within the nucleus pulposus (NP) tissue. (A) Glycosaminoglycans (GAG) content analysis and (B) hydroxyproline (HYP) content analysis. Data are expressed as mean ± SD. *: significant difference (P<0.05) between two groups. #: significant difference (P<0.05) compared with the 1.3 MPa group.
