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Mass spectra of two metabolites differentially accumulating in Arabidopsis wild-type (Ler WT) and mutant plants (Ler tt4 mutant). The flavonoid glycoside Rha-Rha-kaempferide ([M+H]+ at m/z 579.1731, in-source fragments at m/z 433.1107 and 287.0500) was not detected in leaves of the tt4 mutant line (A), whereas the glucosinolate gluconasturtiin ([M+Na]+ at m/z 446.0611) accumulated to much higher amounts in the roots of tt4 plants (B).
