SELE and COVID-19: Among the tested biomarkers, only E-selectin levels (r2 = 0.84; p < 0.0001, Figure 2A) and soluble intercellular adhesion molecule-1 (sICAM-1) levels (r2 = 0.83; p < 0.0001 Figure 2B) significantly and inversely correlated with blood baseline sHLA-G levels in COVID-19 patients.