TP53 and neoplasm: Next, the biodistribution of 125I-4H5 and 125I-7B9 (50 μg, 200 kBq) was evaluated in a dual tumor mouse model, with one mouse primary tumor (Mut-T-B6) expressing the mutp53 protein (p53R172H/R172H) on the right posterior flank and one p53 lacking mouse primary tumor B16-KO on the left (Fig. 4).