Stem/progenitor cell lymphomas also dominated in Eμ‐BCL2/Eμ‐MYC DT, Eμ‐Bclx/Eμ‐MYC DT and Vav‐Mcl1/Eμ‐MYC DT mice 29, 31, 32, while Vav‐BCL2/Eμ‐MYC DT mice developed IgM−CD19+CD43+ pro‐B cell tumours 30. Here, VAV1 is linked to lymphoma.