As can be seen, on the left for allogeneic trogocytosis experiments and on the right for autologous trogocytic experiments, donor cells (CD19ˉ LCL-HLA-G1 and CD19+-gated B-CLL tumor cells, respectively) were positive for PKH67-associated fluorescence and, in the case of LCL-HLA-G1 cells, for membrane-bound HLA-G1 as well (PKH67hi donor cells). The gene discussed is CD19; the disease is B-cell chronic lymphocytic leukemia.