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Flow cytometric analysis of the peripheral blood shows numerous granulocytes (73%), as well as some monocytes (4%) and lymphocytes (10%). CD19+ blasts (approximately 12%) largely lack expression of CD20 but are positive for CD34 and variable CD10. The blasts also show partial expression of CD13 and CD33. Background granulocytes, monocytes, T cells, and natural killer cells are red; B-lymphoblasts are blue, and mature B cells are green.
