Metabolic Profiling of Serum for Osteoarthritis Biomarkers

Figure 2

PCA and PLS-DA score plots. (a) (ESI+) PCA. (b) (ESI-) PCA. (c) (ESI+) PLS-DA. (d) (ESI-) PLS-DA. The abscissa is the first principal component PC1, and the ordinate is the second principal component PC2. The number is the score of the principal component, which represents the percentage of the explanation on overall variance of the specific principal component.

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