CD40LG and COVID-19: Indeed, downregulation of several proinflammatory genes, including CSF1, LAT, LTA, BTLA, CD40LG, JAK1, TNFSF14, and TNFRSF9, was evident in CD4+ T cells of patients who recovered from COVID-19 as compared with healthy controls (Figure 1I), with LAT and BTLA also downregulated in CD8+ T cells (Figure 1J).