SLF2 and lymphoma: To capture the consequences of SLF2 loss in primary BCLs, we cultured primary control (non‐PB) murine Eμ‐myc;Rosa26Cas9 lymphoma cells and subsequently transduced the B‐cell lymphoma cells with either a non‐targeting control sgRNA or the Slf2‐sgRNA used in the in vivo validation experiment to deplete SLF2 (Fig 2G).