CD40LG/LYN protein level ratio in blood (Ontology of Biological Attributes id OBA_2054213) can be described as follows. A compound attribute that is the ratio of amount of CD40 ligand (human) in blood to amount of tyrosine-protein kinase Lyn (human) in blood. Also known as: the ratio of amount of CD40 ligand (human) in blood to amount of tyrosine-protein kinase Lyn (human) in blood.