CD19 and acute myeloid leukemia: Occurrence of grades 2–4 aGVHD in AML patients was associated with high levels of many effector immune cells in the graft: CD4+ cells (Figure 4C; p = 0.039), CD8+ cells (Figure 4D; p = 0.032), CD19+ cells (Figure 4E; p = 0.044), and CD123+ (Figure 4F; p = 0.011).