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Orthogonal projections to latent structures with discriminant analysis (OPLS-DA) score plot showing the separation between bronchoalveolar lavage (BAL) and bronchial wash (BW) samples independent of exposure and inclusive of all variables. Model parameters were: 1 predictive and 1 orthogonal component, R 2 X (cum) = 0.425; R 2 Y (cum) = 0.302; Q 2 (cum) = 0.243; CV-ANOVA = 0.0002
