A compound attribute that is the ratio of amount of mitotic spindle assembly checkpoint protein MAD1 (human) in blood to amount of nicotinamide/nicotinic acid mononucleotide adenylyltransferase 1 (human) in blood. The trait is OBA_2053883 (MAD1L1/NMNAT1 protein level ratio in blood). Also known as: the ratio of amount of mitotic spindle assembly checkpoint protein MAD1 (human) in blood to amount of nicotinamide/nicotinic acid mononucleotide adenylyltransferase 1 (human) in blood.