TABLE 2.

Cell Mg²⁺ content^a

Strain	Grown in 10 mM Mg2+b	Mgt protein expressed	Mg2+ content ± SD (nmol/OD600)
MM281	+	None	1,397 ± 117
MM1490	+	MgtB	1,916 ± 73
MM1665	+	None	1,253 ± 70
MM1665c	−	MgtC	904 ± 49

^aMg²⁺ content was measured by atomic absorption as described in Materials and Methods in four individual cell samples. A second experiment gave comparable results. 

^b+, grown in the presence of 10 mM Mg²⁺; −, grown in the absence of Mg²⁺. 

^cCells were starved for Mg²⁺ for 41 h.