Bone marrow from mOVA mice was stained for OVA expression with polyclonal anti-OVA antiserum and secondary antibody (or secondary along as a control) and evaluated on CD45dim-CD34+ hematopoietic stem cells and CD45hi-CD3+ T cells (B). B6.Thy1.1 mice were given with four weekly transfusions of HOD or control wild-type FVB blood (with no HOD expression) followed by BMT from mOVA donors (Thy1.2). Some mice were infected with PyV or PyV.OVA-I as indicated. Engraftment was assessed 6 weeks after BMT (C). Peripheral blood of animals from each group was stained with anti-CD8 and Kb/SIINFEKL tetramer or Db/LT359 tetramer at the indicated timepoints (D + E). Symbols for panel C, D: FVB ●, HOD ■, PyV + FVB ○, PyV + HOD □, PyV.OVA-I △. Data shown are representative of 3 separate experiments with 2 to 3 mice per group. Error bars represent the standard deviation for the data point.