CD3D and CD3E are components of the T cell receptor signaling complex, confirming T cell lineage identity across all T cell subpopulations. NCR1 (NKp46) and NCAM1 (CD56) confirm NK cell lineage identity. Together these markers define the T and NK cell compartment encompassing CD4⁺, CD8⁺, regulatory, MAIT, proliferating T cells, ILC3s, and CD56⁺CD16⁺ and CD56⁺CD16⁻ NK cell subtypes.