Flow cytometric analysis of the 4 neutrophil cell populations before and after MACS purification. (A) MBs/PMs. (B) MCs/MMs. (C) BCs/SCs. (D) PMNs. Separations are from Percoll-separated human bone marrow cells before (Ai,Bi,Ci,Di) and after (Aii,Bii,Cii,Dii) depletion of nonneutrophil cells.