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Stimulatory effects of triterpenoids from E. japonica leaves on hyaluronic acid (HA) production. Data are the means ± SD of three independent tests, and all data were calculated as percentages compared with the control values. Ascorbic acid (100 μM) was used as a positive control. * The promoting ratio (or HA/CV value) represents the mean of hyaluronic acid (%)/the mean of cell viability (%).
