A compound attribute that is the ratio of level of MHC class I polypeptide-related sequence A in blood to amount of angiopoietin-1 receptor (human) in blood. The trait is Ontology of Biological Attributes entry OBA_2054456 (MICA/TEK protein level ratio in blood). Also known as: the ratio of level of MHC class I polypeptide-related sequence A in blood to amount of angiopoietin-1 receptor (human) in blood.