FGR/PADI4 protein level ratio in blood (OBA_2055392, an Ontology of Biological Attributes entry) can be described as follows. A compound attribute that is the ratio of amount of tyrosine-protein kinase Fgr (human) in blood to amount of protein-arginine deiminase type-4 (human) in blood. Also known as: the ratio of amount of tyrosine-protein kinase Fgr (human) in blood to amount of protein-arginine deiminase type-4 (human) in blood.