The percentages of polyfunctional (IFNγ+TNFα+) total MAIT cells and CD4+ MAIT cells were reduced in melanoma patients compared to HD, while no changes in the production of these cytokines by CD8+ or double‐negative (CD4−CD8−, DN) MAIT cells were observed (Figure 1f and Supplementary figure 1c). The gene discussed is CD4; the disease is melanoma.