Ontology of Biological Attributes id OBA_2053199 (PRTFDC1/TDRKH protein level ratio in blood) can be described as follows. A compound attribute that is the ratio of amount of phosphoribosyltransferase domain-containing protein 1 (human) in blood to amount of tudor and KH domain-containing protein (human) in blood. Also known as: the ratio of amount of phosphoribosyltransferase domain-containing protein 1 (human) in blood to amount of tudor and KH domain-containing protein (human) in blood.