The amount of a probable bifunctional dTTP/UTP pyrophosphatase/methyltransferase protein when measured in blood serum. The trait is OBA_2040702 (level of probable bifunctional dTTP/UTP pyrophosphatase/methyltransferase protein in blood serum). Also known as: blood serum probable bifunctional dTTP/UTP pyrophosphatase/methyltransferase protein amount.