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The inconsistence of Col2+ cells and type II collagen expression in mice intervertebral disc (IVD). A‐D, The expression Col2+ cells by lineage tracing of Col2‐creERT;tdTomato, Col2‐cre;tdTomato mice, and Col2α1 expression examined by IF staining in IVD at P6 (A), P30 (B), P187 (C), and P365 (D). Six mice were evaluated in each group. Scale bar = 200 μm
