MAPKAPK2 and COVID-19: In the plasma of the COVID-19 patients studied, a large group of modified MDA proteins are kinases (MAP kinase-activated protein kinase 2 (MAPKAPK2, P49137), ribose-phosphate pyrophosphokinase 3 (PRPS1L1, P21108), and cAMP-dependent protein kinase (PKA, P22612)).