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Comparison of cell growth in PB- and CB-derived CD34+ cell cultures. Stem cells were cultured for 21 days and counted at the end of each phase. (a) Erythroid cell amplification (mean ± standard deviation) of mPB- and CB-derived CD34+ cells. (b) Numbers of total cells expanded from cultures of mPB- and CB-derived CD34+ cells. CB-CD34+ cells exhibit higher amplification efficiency than mPB cells. *P< 0.001.
