Enhanced in vitro function of cells differentiated in the presence of Li and VPA. Cells differentiated in vitro with or without VPA and/or Li were assayed for progenitor/stem cell activity. (A) CFU-GM data showing effect of the compound treatment on the total number of colonies. Shown is the mean ± SD. (B) CAFC data showing progenitor (day −7) and stem cells (day −35) activity of 7-day cultured cells. The differences between groups were evaluated by Welch t test, *P < .05 and **P < .01.