A compound attribute that is the ratio of amount of secretory carrier-associated membrane protein 3 (human) in blood to amount of syntaxin-4 (human) in blood. The trait is OBA_2053322 (SCAMP3/STX4 protein level ratio in blood). Also known as: the ratio of amount of secretory carrier-associated membrane protein 3 (human) in blood to amount of syntaxin-4 (human) in blood.