Fig. 5. Effects of 30% low sodium concentration itself on change in relative bis-oxonol fluorescence in human coronary artery smooth muscle cells. (A ) Representative variations of fluorescence intensity. Bis-oxonol fluorescence was measured relative to the normal sodium concentration (percent). At the point indicated (arrow ), the values were evaluated. (B ) Thirty-percent low sodium concentration itself significantly reduced the fluorescence (n = 6). Values are expressed as mean ± SD. *P < 0.05 versus  the value of 30% hypotonicity.