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. 2007 Mar 10;12(3):406–414. doi: 10.3390/12030406

Figure 2.

Figure 2

Concentrations of ketones 3 and 4 in two-year-old roots from six species of Echinacea. Error bars indicate standard deviations of means of triplicate experiments. For each ketone, different letters indicate a significant difference (p < 0.01).