A compound attribute that is the ratio of amount of Friend leukemia integration 1 transcription factor (human) in blood to amount of mediator of RNA polymerase II transcription subunit 18 (human) in blood. The trait is FLI1/MED18 protein level ratio in blood (OBA_2055252). Also known as: the ratio of amount of Friend leukemia integration 1 transcription factor (human) in blood to amount of mediator of RNA polymerase II transcription subunit 18 (human) in blood.