C57BL/6 mice received syngeneic isografts or fully MHC-mismatched (A/J) allografts. 72 hours after transplant CD8 T cells were collected from the blood and also flow-sorted from the transplanted heart. Genomic DNA was prepared and TCR repertoire analysis completed. Data are presented as a clonality score where 0 = a diverse repertoire and 1 = an oligoclonal sample.