A compound attribute that is the ratio of amount of CD40 ligand (human) in blood to amount of TNF receptor-associated factor 2 (human) in blood. The trait is CD40LG/TRAF2 protein level ratio in blood (Ontology of Biological Attributes term OBA_2054217). Also known as: the ratio of amount of CD40 ligand (human) in blood to amount of TNF receptor-associated factor 2 (human) in blood.