While performing initial characterisation of the model, we observed that as expected, all of the WT Eμ-Myc cells ‘homed’ to organs of lymphoid origin; the spleen, lymph nodes and thymus (Supplementary Figure S3D), as we have also seen previously with Eμ-Myc lymphomas from c-Rel null mice [40]. The gene discussed is MYC; the disease is lymphoma.