Furthermore, there was increased expression of the inhibitory Fc receptor CD32B on classic memory B cells (CD20+CD19+IgD−; P = 0.005) and non-naive B cells (CD20+CD19+IgD− and CD20+CD19+IgD+CD27+; P = 0.009) as well as classical and nonclassical monocytes in AML marrow compared to those from healthy control individuals (Fig. 3d). Here, CD19 is linked to acute myeloid leukemia.