Fig. 1.

The ratio of the number of contracting cell aggregates to the total number of cell aggregates in 3 concentric areas. The value of each bar represents the ratio calculated from a total of 96 wells and 93 wells for sham and IF–MF, respectively, in 4 independent exposures. The diameter ranges of each area are 0–2.56 mm (area 1), 2.56–5.12 mm (area 2) and 5.12–7.7 mm (area 3). ^†The values of the induced electric field and the induced current density were calculated as those at the diametrical median point of each area (1.28, 3.84 and 6.4 mm from the center of the well for area 1, 2 and 3, respectively). The number in each bar indicates the number of contracting cell aggregates to the total number of cell aggregates.