(A) Action potentials recorded from 2D cardiomyocyte monolayer with 40K cells/well with average trace shown on the right with error bars (SD) (B) Action potentials recorded from 3D EHT with average trace shown on the right with error bars (SD). (C) Calcium transients recorded from 2D cardiomyocyte monolayer with 40K cells/well with the average trace shown to the right with error bars (SEM)(D) Calcium transients recorded from 3D EHT with the average trace shown on the right with error bars (SEM).
