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The proliferation rate of hMSC is donor dependent. Cumulative population doublings of hMSC from 3 different donors (A, B, C) and AS-M.5 (D) in cultures supplemented with M1 (diamonds, full line), M3 (triangles, dashed), and M2 (squares, dashed line) in the course of 21 days of cultivation. Indicated are means +/- SEM.
