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Serum clustering based on sera reactions with LPS O3 and correlated wavenumbers 1492 cm−1, 1493 cm−1, 1594 cm−1, 1650 cm−1 and 752 cm−1: (a) Principal component analysis, (b) Hierarchical cluster analysis. Serum clustering based on sera reactions with Lys-GalA and correlated wavenumbers 1503 cm−1, 1505 cm−1, 1505 cm−1, 1513 cm−1 and 781 cm−1: (c) Principal component analysis, (d) Hierarchical cluster analysis.
