(A) The generation of CB CD34+ and CD34+CD90+ cells in the presence of cytokines occurred to a greater degree in SF than in SC cultures. A significant difference in the fold increase of CD34+ and CD34+CD90+ cells was observed in VPA-containing SF cultures as compared with SC cultures. *P < 0.05; **P < 0.005; ***P < 0.0005 (mean ± SEM; ANOVA, P < 0.0001; n = 6–7). (B) Phenotypic analysis of PC and CD34+ cells treated in SF media under control conditions or in the presence of VPA. Each cell population was analyzed for the expression of CD34, CD90, CXCR4 (CD184), CD49f, and CD45RA. The coexpression of CD184, CD49f, and CD45RA by CD34+CD90+ cells (red box) is depicted (n = 4).