CD8A and chronic myelogenous leukemia, BCR-ABL1 positive: We sorted PR1 specific CD8 + T cells from 12 samples from 6 CML patients with HLA-A*02:01 PR1-targeting peptide-major histocompatibility complex (pMHC) tetramers, analyzed them with TCRβ-sequencing and received 772 PR1-specific TCRβs (Fig. 5b).