although transferrin reacts with the vanadate anion , studies on the transferrin model compound ethylenebis ( o-hydroxyphenylglycine ) indicate that at ph 9.5 , the vanadium is binding at the metal-binding site as a dioxovanadium ( v ) cation coordinated to two phenolic residues at each binding site .
C0042305
vanadate
C0003075
anion