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. 2015 Mar 16;2015:684794. doi: 10.1155/2015/684794

Figure 1.

Figure 1

PCA (a) and PLS-DA (b) analysis based on serum UPLC-MS data showed clear tendency of separation in patients with OA and healthy controls. Further PLS-DA analysis within patients with OA showed stratification between mild and severe OA (c).