1.2.1.75 Ca2+ stimulation in decreasing order: Fe2+, Ca2+, Mg2+ 698563 1.2.1.75 Fe2+ stimulation in decreasing order: Fe2+, Ca2+, Mg2+ 698563 1.2.1.75 Mg2+ 1 mM used in assay conditions 762978 1.2.1.75 Mg2+ 2fold stimulation at 5 mM 698575 1.2.1.75 Mg2+ stimulation in decreasing order: Fe2+, Ca2+, Mg2+ 698563 1.2.1.75 Mn2+ 2fold stimulation at 5 mM 698575