level of guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-12 in blood serum (OBA_2041753, an Ontology of Biological Attributes identifier) is the amount of a guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-12 when measured in blood serum. Also known as: blood serum guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-12 amount.