KLRG1 and infection: Based on KLRG1 and CD127 co-expression and expression of the T-box transcription factors T-bet and eomesodermin (eomes), no differences were seen in markers of effector and memory differentiation by TCR-V cells recruited by MuPyV.TagV, MuPyV.TagV(AN), and MuPyV.TagV(QN) infection (Fig 3B–3D).