4.2.99.18	Ca2+	optimal concentration at 5-30 mM, only 50% activity at 40 mM	648668	
4.2.99.18	Ca2+	presence of 1 or 5 mM Ca2+ causes much less efficient stimulation of HpXth's AP site cleavage activity as compared to Mg2+ or Mn2+	749127	
4.2.99.18	Ca2+	stimulates	648635	
4.2.99.18	Co2+	0.1-1.0 mM, strong stimulation of all DNA repair activities	730783	
4.2.99.18	Co2+	CoCl2 (500 microM) is essential for AP endonuclease assay. Effects of Co on APE/Ref-1 are concentration dependent	690475	
4.2.99.18	Co2+	stimulation	648624	
4.2.99.18	Cu2+	activates at 0.01 mM, inhibits at 0.1 mM	749127	
4.2.99.18	Fe	pro-inflammatory activity of iron in the lung injury, at least in part, because of its induction of APE/Ref-1	690475	
4.2.99.18	Fe2+	0.1-1.0 mM, strong stimulation of all DNA repair activities	730783	
4.2.99.18	Fe2+	activates at 0.01 mM, inhibits at 0.1 mM	749127