HLA-A and leukemia: The transgenic J76 cells modified with the ER6, ER12, and ER28 TCR receptors were stimulated by PBMC from healthy donors or leukemia patients with HLA-A*02:01+ HA-1+/+, HA-1+/−, HA-1−/− and HLA-A*02:01− (Figure 3C,D).