Genes coding for metallothioneins (MT1A, MT1X, MT1M), metal‐ion binding proteins which potently control oxidative stress by capturing superoxide and hydroxyl radicals, were the most down‐regulated genes in macrophages isolated from convalescent COVID‐19 patients (Subramanian Vignesh & Deepe, 2017) (Fig 5D). The gene discussed is MT1X; the disease is COVID-19.