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Principal component analysis (PCA) scores plots (PC1 vs. PC2) for data collected for three sample types applying the HILIC positive ion mode assay. The sample classes are pooled QC: yellow; domestic short hair cat: green, Norfolk terrier: light blue, Labrador retriever: dark blue, Beagle: red, and Petit Basset Griffon Vendeen: pink. The PC1 and PC2 variances were 31.1 and 8.2% (dried blood spot, DBS, 20 μL), 30 and 7.9% (DBS 40 μL), 25.5 and 7.5% (plasma).
