Quantitative RT-PCR expression analysis of miR-17 in human CB CD34+Lin- after 5 days, respectively, of coculture on OP9 stromal cells expressing different Notch ligands Graphs show mean expression, relative to the geometric mean of SNORD61, SNORD95 and RNU6-2 and relative to the OP9-DLL1 cultured cells (n=2 independent experiments with different donors; error bars indicate SEM - the two data points are shown). 