MRM chromatograms with the mass transition m/z 179/89 for aldohexose isomers. Lowercase letters indicate samples from which the peaks originate. (A) Overlay of chromatograms for the (a) galactose standard sample, (b) mannose standard sample, and (c) acid hydrolysate of LBG standard sample. (B) Overlay of chromatograms for the (a) galactose standard sample, (b) mannose standard sample, and acid hydrolysates of extracts from (d) stem, (e) endosperm, (f) leaf, and (g) callus tissues.