FCGR2B/NOS3 protein level ratio in blood (OBA_2055216, an Ontology of Biological Attributes id) can be described as follows. A compound attribute that is the ratio of amount of low affinity immunoglobulin gamma Fc region receptor II-b (human) in blood to amount of nitric oxide synthase 3 (human) in blood. Also known as: the ratio of amount of low affinity immunoglobulin gamma Fc region receptor II-b (human) in blood to amount of nitric oxide synthase 3 (human) in blood.