Flow cytometric analysis of CCR5 during megakaryocytic (Mk), monocytic (Mo), granulocytic (G), and erythroid (E) differentiation of HPCs. Cells were collected for analysis at the indicated days of culture and double-labeled with PE-conjugated anti-CCR5 MoAb (clone 2D7) along with the specific FITC-conjugated cell lineage MoAbs. Representative results from 1 of 3 independent experiments are shown.