TP53 and B-cell non-Hodgkin lymphoma: Figure 8A shows that B cells from p53rev/revCD19-cre+ mice were induced to express p53 protein while no detectable p53 protein was found in the B cells of p53rev/revCD19-Cre− mice. No B cell lymphomas were observed in ten p53rev/revCD19-Cre+ mice followed for 9 months, while tumors developed in seven of nine p53rev/revCD19-Cre− mice (Figure 8B).