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. 2016 Jul 29;11(7):e0159829. doi: 10.1371/journal.pone.0159829

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© 2016 Hsu et al

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Fig 2 — The first two calculated principal components (PC1 and PC2), which contained most of the information, were plotted against each other for visualization. The PC1 accounting for the largest Raman spectra variance was 88.48%, and PC2 was 8.26%. The two-dimensional plots showed the separation of gastric adenocarcinoma from normal gastric mucosa (▽: normal gastric mucosa; ●: signet ring cell adenocarcinoma; □: mucinous adenocarcinoma; Δ: tubular tubular adenocarcinoma; ○: papillary adenocarcinoma).