A similar expansion of the pre‐B‐cell compartment was also observed in Eμ‐myc; Pot1b∆/∆ mice, suggesting that malignant B‐cell clones, while present in Eμ‐myc; Pot1b∆/∆ mice, were incapable of forming lymphomas (Fig. 1D and Table 1). This evidence concerns the gene MYC and lymphoma.