FASLG and COVID-19: Analysis of the correlation of FAS and FASL expression and IFN-γ plasma levels in individuals with COVID-19 revealed slight positive correlations between FAS and FASL expression levels (r = 0.392; p = 0.0257; Figure 5A), between FAS expression and IFN-γ plasma levels (r = 0.4603; p = 0.0006; Figure 5B), and between FASL expression and IFN-γ plasma levels (r = 0.2624; p = 0.0602; Figure 5C).