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Structure–function analysis of luteolin analogues using an HPLC-based ppGalNAc-T assay with EA2 peptide. a, the IC50 are calculated as percentages of the control (DMSO, 100%) and shown as the mean ± S.D. (n = 3). b, the inhibitory ratio (%) was calculated with the positive control (DMSO, 0%) (50 μm compounds). c, isorhamnetin did not show any inhibitory activity at 200 μm. d, the inhibitory ratio of fisetin at 200 μm is 23.87 ± 0.4%. N.I., no inhibition.
