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Distribution of hederagenin cellobioside and oleanolic acid cellobioside in 127 F2 plants with different resistance to flea beetle larvae. Intensities of [M+Na]+ for the two compounds (m/z 819 for hederagenin cellobioside and m/z 803 for oleanolic acid cellobioside) were used. The resistant and susceptible extremes used in the alignment of the LC-MS profiles by MetAlign are marked by arrows.
