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. 2022 Oct 12;10:16. doi: 10.1186/s40170-022-00294-9

Fig. 1.

Fig. 1

Hierarchical cluster analysis by correlations and heat map visualization for ESI-positive (A) and ESI-negative (B) metabolites. Color labels correspond to the 12 clusters used to identify representative metabolites. The interior of the heat map is colorized according to the Log2 normalized metabolite concentration, standardized to have means of zero and standard deviations of one: blue for low, yellow for average, and red for high. The samples are labeled yellow for cancer and purple for control