A compound attribute that is the ratio of amount of mannose-6-phosphate isomerase (human) in blood to amount of phosphopantothenoylcysteine decarboxylase (human) in blood. The trait is OBA_2054549 (MPI/PPCDC protein level ratio in blood). Also known as: the ratio of amount of mannose-6-phosphate isomerase (human) in blood to amount of phosphopantothenoylcysteine decarboxylase (human) in blood.