<p>Cell viability was analyzed with the MTT proliferation assay. One-fold (1x) DSW was defined as water-diluted DSW containing a level of magnesium equal to that of the magnesium chloride used in the present experiment. The results are shown as % of the control. *<i>P</i><0.05, and **<i>P</i><0.01 compared with the 15% FBS-treated group, respectively.</p