1.14.13.38 Ca2+ increase of activity at 0.1-2 mM 438860 1.14.13.38 Co2+ increase of activity 438860 1.14.13.38 Cu2+ increase of activity 438860 1.14.13.38 Fe2+ increase of activity 438859, 438860 1.14.13.38 Fe3+ increase of activity 438860 1.14.13.38 Mg2+ increase of activity at 0.1-1 mM 438860 1.14.13.38 Mn2+ increase of activity 438860 1.14.13.38 Ni2+ increase of activity 438860