CD8A and neoplasm: In another experiment, the tumor cells were loaded with hgp10025–33 or SIINFEKL before co-culturing with BUSA14 or BWZ.36/CD8α As shown in Fig. 4B, incubation in presence of all three hgp10025–33 loaded tumor lines resulted in activation of BUSA14 as detected by CPRG assays.