IX.A.001

Normal blood cells. Flow cytometry. Staining pattern for CD45 (leukocyte common antigen, LCA) and light scatter. Individual cell populations are illustrated in identical colors on both CD45 vs. side-scatter and forward-angle vs. side-scatter: R2 = lymphocytes (red), R3 = monocytes (pink), R4 = granulocytes (blue), R5 = immature cells (green). Note that in normal blood samples, the immature cell population is negligible, but can be more prominent in blood samples of patients with inflammatory and other reactive states, samples from young infants, and patients who have received hematopoietic growth factor treatment.