Density distribution of PS-exposing sickle cells.

Sickle cells were separated on Stractan density gradients, and FITC-AV labeling was assessed as described in “Materials and methods.” The number of AV-binding cells in each fraction, calculated by multiplying the percentage of AV-binding cells with the total number of cells in that fraction, is expressed as a percentage of the total AV-binding population. The graph shows the mean and SD of blood samples from 5 sickle cell patients.