In contrast, 12/26 Mnt+/+MYC10hom and 7/24 Mnt+/+MYC10hom/Rag1Cre control mice developed massive thymi (up to 1440 mg) and 14/15 of those immunophenotyped were CD4+CD8+ T lymphomas (the other being a CD19+ B lymphoma) (Supplementary Fig. S6A–C and Tables S1, S2). This evidence concerns the gene CD4 and lymphoma.