Annexin labeling of sickle cells.

Sickle cells (SS) or RBCs from healthy volunteers (AA) were labeled with FITC-AV and the percentage of labeled cells was assessed by flow cytometry. Each data point ((▵,▿) indicates the percentage of AV-binding cells obtained for each individual sample, and the mean (○) and SD (error bars) of 147 sickle cell samples from 110 donors and 18 normal controls are shown (repeat samples from the same donor taken at different times were averaged).