[Retracted] Identification of Serum Metabolomics Characteristics in Patients with Stable Angina Pectoris Using UHPLC-QE-MS

Figure 4

Correlation analysis and clustering heatmap of potential biomarkers in serum. (a) Heatmap of hierarchical clustering analysis of the metabolites determined from serum samples (increasing expression values are coded with blue to red colors. Rows indicate potential biomarkers; columns indicate different groups). (b) Heatmap of correlation analysis of the metabolites determined from serum samples. The rows and columns represent the different metabolites compared in this group. The color blocks at different positions represent the correlation coefficient between the metabolites at corresponding positions. Red represents positive correlation, and blue represents negative correlation; the darker the color, the stronger the correlation. Meanwhile, the significance in correlation was marked with an asterisk.

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