a vitamin b12-binding protein ( haptocorrin ) from chicken serum has been purified to homogeneity by photodissociative affinity chromatography and characterized by gel electrophoresis and uv-visible spectrophotometry of its aquocobalamin , hydroxocobalamin , and cyanocobalamin complexes .
C0020316
hydroxocobalamin
C0042845
cyanocobalamin