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Flow cytometric analysis of cell cycle. Old HDF cells were pretreated with either vehicle or Rg3(S) (10 μM or 30 μM) for 48 h. Old HDFs were stained with PI and then compared with young HDFs. Percentages of cells in sub-G1, G1, S, and G2/M phases are given in each graph. HDF, human dermal fibroblast; PI, propidium iodide.
