A compound attribute that is the ratio of amount of histidine--tRNA ligase, cytoplasmic (human) in blood to amount of RWD domain-containing protein 1 (human) in blood. The trait is HARS1/RWDD1 protein level ratio in blood (OBA_2053133). Also known as: the ratio of amount of histidine--tRNA ligase, cytoplasmic (human) in blood to amount of RWD domain-containing protein 1 (human) in blood.