A compound attribute that is the ratio of amount of C-C motif chemokine 13 (human) in blood to amount of C-C motif chemokine 2 (human) in blood. The trait is CCL13/CCL2 protein level ratio in blood (OBA_2054810). Also known as: the ratio of amount of C-C motif chemokine 13 (human) in blood to amount of C-C motif chemokine 2 (human) in blood.