Additionally, the co‐expression of exhaustion markers TIM‐3 (T‐cell immunoglobulin and mucin‐domain containing‐3) and LAG‐3 (Lymphocyte activation gene‐3), as well as PD‐1 (Programmed cell death protein‐1), was similar between ALL‐ and CLL‐derived T cells (Figure 1C). Here, LAG3 is linked to acute lymphoblastic leukemia.