Table 2.

Mean number of induced delayed afterdepolarizations per cell

	Dct-null CMLCs N = 11	Dct-het CMLCs N = 12	Atrial myocytes N = 23
Baseline	0.83 ± 0.22*†	0	0
5 μmol/L H2O2	1.49 ± 0.34*†	0.88 ± 0.26†‡	0.32 ± 0.25*‡
10 μmol/L H2O2	1.67 ± 0.32*†	1.04 ± 0.28†‡	0.44 ± 0.30*‡
25 μmol/L H2O2	1.92 ± 0.41†	1.22 ± 0.42	0.72 ± 0.38‡
50 μmol/L H2O2	2.15 ± 0.40†	1.64 ± 0.42	1.09 ± 0.40‡

Atrial myocyte group contains data combined from both Dct-null and Dct-het atrial myocytes.

^*P < 0.05 compared to Dct-het melanocytes at same H₂O₂ concentration.

^†P < 0.05 compared to Dct-null and Dct-het atrial myocytes at same H₂O₂ concentration.

^‡P < 0.05 compared to Dct-null melanocytes at same H₂O₂ concentration.