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. 2013 May 17;8(5):e64302. doi: 10.1371/journal.pone.0064302

Table 2. Histomorphometric grading scheme for early degenerative changes to the NP of the mouse IVD.

Status of notochordal band
0 Distinct and thin
1 thicker, disorganized, loss of distinct margins with mature NP matrix
2 diminished to cluster of cells
3 complete loss of notochordal band