A compound attribute that is the ratio of amount of proto-oncogene tyrosine-protein kinase Src (human) in blood to amount of F-box-like/WD repeat-containing protein TBL1X (human) in blood. The trait is SRC/TBL1X protein level ratio in blood (OBA_2055711, an Ontology of Biological Attributes identifier). Also known as: the ratio of amount of proto-oncogene tyrosine-protein kinase Src (human) in blood to amount of F-box-like/WD repeat-containing protein TBL1X (human) in blood.