We have previously reported that Dnmt3a inactivation in hematopoietic stem cells results in chronic lymphocytic leukemia (CLL) and CD8-positive peripheral T cell lymphomas (PTCL) in EμSRα-tTA;Teto-Cre;Dnmt3afl/fl; Rosa26LOXPEGFP/EGFP (Dnmt3aΔ/Δ) mice. The gene discussed is CD8A; the disease is peripheral T-cell lymphoma, not otherwise specified.