The amount of a U11/U12 small nuclear ribonucleoprotein 25 kDa protein when measured in blood serum. The trait is Ontology of Biological Attributes identifier OBA_2043571 (level of U11/U12 small nuclear ribonucleoprotein 25 kDa protein in blood serum). Also known as: blood serum U11/U12 small nuclear ribonucleoprotein 25 kDa protein amount.