A compound attribute that is the ratio of amount of GRB2-related adapter protein 2 (human) in blood to amount of cytoplasmic protein NCK2 (human) in blood. The trait is Ontology of Biological Attributes entry OBA_2053441 (GRAP2/NCK2 protein level ratio in blood). Also known as: the ratio of amount of GRB2-related adapter protein 2 (human) in blood to amount of cytoplasmic protein NCK2 (human) in blood.