Effect of Mg2+ ion binding to CaM on LCST behavior of CaM-ELP60. Solution turbidity at 350 nm (OD350) as a function of solution temperature for apoCaM-ELP60 (filled circles, red), Ca2+-CaM-ELP60 (filled squares, blue), Mg2+-CaM-ELP60 with 0.5 mM Mg2+ (filled triangles, light purple), Mg2+-CaM-ELP60 with 10 mM Mg2+(filled inverse triangles, dark purple).