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Principal Component Analysis (PCA). The Scree plot demonstrates the Eigenvalues of the principal components in the PCA analysis. The PCA presents one component with an eigenvalue of > 1, which explains 98.03% of the total variation in cell cycle gene expression at 4 weeks (a). Similarly, one component with an eigenvalue of > 1 illustrates 97.92% of the total variation in cell cycle gene expression at 12 weeks (b)
