In isolated cardiomyocytes, the fluorescence intensity levels for TRPM6 and for TRPM7 for hearts in SR were 0.07 ± 0.002 a.u. and 0.13 ± 0.000 a.u., respectively (n = 14–16), whereas for hearts with AF the fluorescence levels were 0.09 ± 0.001 a.u. and 0.14 ± 0.002 a.u., respectively (n = 12–17, Figure 8A). Here, TRPM7 is linked to atrial fibrillation.