Immunocytochemistry of blood and BM. (A) Blood smear from a healthy donor stained with MoAb AAA4 shows NAMLAA-positive granulocytes and an NAMLAA-negative monocyte (arrow). (B) BM smear after staining with AAA4 shows an NAMLAA-positive promyelocyte and a mature granulocyte, both NAMLAA-positive.