Cord blood was obtained after informed consent under a protocol approved by the Cambridgeshire 4 Research Ethics Committee (07/MRE05/44). CD34-positive cells (≥98%) isolated by magnetic cell sorting (Myltenyi Biotec) were seeded at 1E+5 cells per ml in CellgroSCGM containing TPO (100 ng ml−1) and IL1-β (10 ng ml−1) and cultivated for 10 days. We routinely obtained 70–90% CD41a+ and 20–60% CD42a+ cells by the end of the culture.
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