Leukemia, Large Granular LymphocyticLeukemia, LymphoidLeukemia, T-CellLymphocytosisRed-Cell Aplasia, PureKiller Cells, NaturalLymphocytesRats, Inbred F344LeukemiaFlow CytometryLeukemia, Myeloid, AcuteLymphocyte ActivationCytotoxicity, ImmunologicLeukemia, ExperimentalLymphoproliferative DisordersFelty SyndromeLeukemia, Lymphocytic, Chronic, B-CellT-LymphocytesAntigens, CD3Antigens, SurfaceLymphocyte SubsetsAntigens, CD57Antigens, Differentiation, T-LymphocyteInterleukin-2