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Immunosuppressive activity of hMSC-conditioned medium. Immunosuppressive activity of unstimulated (white bars) and PBMC-stimulated (black bars) hMSCs and hMSC-conditioned media. Values are expressed as percent inhibition relative to PHA-stimulated PBMCs which served as controls. Higher bars indicate more immunosuppressive activity. Asterisks indicate significant differences in one-tail t-test; *P < .01.
