FLT1/TGFB1 protein level ratio in blood (OBA_2055257, an Ontology of Biological Attributes entry) can be described as follows. A compound attribute that is the ratio of amount of vascular endothelial growth factor receptor 1 (human) in blood to amount of transforming growth factor beta-1 (human) in blood. Also known as: the ratio of amount of vascular endothelial growth factor receptor 1 (human) in blood to amount of transforming growth factor beta-1 (human) in blood.