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. 2016 Feb 11;6:20766. doi: 10.1038/srep20766

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(a) The concentrations of lupeol are 0 μM, 5 μM, 10 μM, and 20 μM, respectively. (b) The concentrations of betulin are 0 μM, 7.5 μM, 15 μM, and 30 μM, respectively. (c) The concentrations of betulinic acid are 0 μM, 2 μM, 3 μM, and 4 μM, respectively.