IGF2 and lymphoma: Specifically, the FF-induced lymphoma, its transplant, and a spontaneous lymphoma showed Dβ1Jβ1 recombination (Fig. 3C, left), whereas the IGF2-induced lymphoma, its transplant, HGF-induced lymphoma, IGF2+HGF-induced lymphoma, and another spontaneous lymphoma showed Dβ2J2 rearrangement (Fig. 3C, right).