Representative extracted ion electropherograms (EIEs) of putatively identified metabolites in replicated single-cell CE-MS runs (malic acid [C4H6O5 + Na+], L-phenyalanine [C9H11NO2 + H+], cycloalliin [C6H11NO3S + H+], glucose [C6H12O6 + Na+], methylcysteine sulfoxide [C4H9NO3S + H+], and adenosine [C10H13N5O4 + H+]). The migration time of each metabolite was normalized with the migration time of malic acid.