Fig. 1
From: Changes in the salivary metabolome in patients with chronic erosive gastritis
Quality control (QC) chart for samples. A, B Principal component analysis (PCA) score charts in the positive and negative ion modes, different graphs represent different samples. CEG group samples = Dark blue dots, N group samples = Purple triangles, and QC samples = Green squares. C, D QC sample correlation map for the positive and negative ion modes