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Heat maps of circadian-oscillating metabolites in the human timetable. Circadian-oscillating metabolite peaks in the plasma samples [positive ions (A); negative ions (B)] are shown. Some metabolites in this heat map were identified and shown in Fig. 4. On the heat maps, magenta tiles indicate a high quantity of substances and green tiles indicate a low quantity in plasma. Metabolites are sorted according to their molecular peak time.
