Assessment of cell death in cultures of CD34⁺ progenitors maintained on FN- versus BSA-coated plates. (A) A total of 500 000 cells from each of the culture conditions were subjected to annexin V (FITC) and 7-AAD staining. FACS acquisition and analysis were done on FACSCalibur. (B) Percentage of live cells from 3 independent experiments using marrow samples from 3 donors.