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PCA and PLS-DA multivariate statistical analysis for UA and HC groups. (A) PCA and (B) PLS-DA scores of UA and HCs in positive ion mode. (C) PCA and (D) PLS-DA scores of UA and HCs in negative ion mode. PCA, principal component analysis; PLS-DA, partial least squares discriminant analysis; UA, unstable angina; HC, health control.
