The amount of a nicotinamide/nicotinic acid mononucleotide adenylyltransferase 1 when measured in blood serum. The trait is OBA_2042599 (level of nicotinamide/nicotinic acid mononucleotide adenylyltransferase 1 in blood serum). Also known as: blood serum nicotinamide/nicotinic acid mononucleotide adenylyltransferase 1 amount.