A compound attribute that is the ratio of amount of breakpoint cluster region protein (human) in blood to amount of GRB2-related adapter protein 2 (human) in blood. The trait is Ontology of Biological Attributes identifier OBA_2053241 (BCR/GRAP2 protein level ratio in blood). Also known as: the ratio of amount of breakpoint cluster region protein (human) in blood to amount of GRB2-related adapter protein 2 (human) in blood.