Time-dependent changes in the HbF content of labeled HDE cells.

Panels on the left show the fraction of HbF, determined by HPLC, in unlabeled cells (open symbols) and magnetically isolated biotin-labeled cells (closed symbols) at each time point after re-infusion. Panels on the right show similar data, except that the percentage of F cells was determined by flow cytometry for unlabeled and biotin-labeled cells.