Bone marrow NK cell expression of intracellular cytokines in patients with NDMM and control subjects. (A) Bone marrow CD3^–CD56⁺CD16⁺ NK cells expressing IFNγ, TNFα, and IL-10 in the resting and stimulated state. (B) Bone marrow CD3^–CD56⁺CD16⁺ NK cells double-positive for IFNγ and TNFα in the resting and stimulated state.