“Competition experiments with LTB4 and the low-affinity (Ki = 165 nM) competitive LTB4-antagonist U75302, also demonstrated that EDTA caused a significant reduction (1.7 and 3.6-fold, P less than 0.05 and P less than 0.01, respectively), in affinity to both ligands.”
“Divalent cations (Mg2+ = Ca2+ greater than Mn2+) stimulated, whereas EDTA inhibited (IC50 = 0.31 +/- 0.08 mM) binding of [3H]LTB4.”