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). This evidence concerns the gene MT1A and COVID-19.