2.4.1.237 Ca2+ slight stimulation 657428 2.4.1.237 KCN slight stimulation 657428 2.4.1.237 Mg2+ slight stimulation 657428 2.4.1.237 additional information no requirement for bivalent cations, UGT71F1 676370 2.4.1.237 additional information no requirement for bivalent cations, UGT73A4 676370 2.4.1.237 additional information no requirement for Mg2+ 489566 2.4.1.237 additional information no requirement for Mg2+, Ca2+ or K+ 489572