TP53 and lymphoma: We generated p19ARF−/− Eμ-tTA TRE-MYC mice (referred to as MYC p19ARF−/− mice) and p53−/− Eμ-tTA TRE-MYC mice (referred to as MYC p53−/− mice) to study the role of tumor suppressors p19ARF and p53 in MYC-induced lymphoma.