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Supportive activity of MSC in contact and non-contact conditions. (A) Absolute number of colony-forming cells after 3 weeks of co-culture initiated with 5000 cord blood CD34+ cells in contact with MSC harvested at indicated passage (P) or in 5000 uncultured CD34+ cells (U). (B) Cultures were conducted in non-contact conditions. *P<0.05, **P<0.01, ***P<0.005, ****P<0.001 versus uncultured CD34+ cells, n≥4.
