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. 2022 Nov 18;2022:6876327. doi: 10.1155/2022/6876327

Figure 2.

Figure 2

The total ion chromatogram and unsupervised principal component analyses (PCA) scores plot made from the serum samples from BEB patients, healthy controls, and QC groups. The total ion chromatogram of the BEB and healthy controls in the (a) positive and (b) negative ionization modes. (c) PCA scores plot generated from all serum samples in positive ionization mode. (d) PCA scores plot generated from all serum samples in negative ionization mode. BEB: benign essential blepharospasm; QC: quality control.