EHTs were generated from cells and fibrinogen/thrombin as previously described.9 For this study, the devices for casting and culturing EHTs were adapted to reach the geometries required for the intended use. Standard EHT patches (1.5×2.5 cm) were generated in a 6-well format (Figure I in the Data Supplement) with 9 to 15×106 hiPSC cardiomyocytes per 1.5 mL. For human-scale EHT patches (5.0×7.0 cm) 430 to 450×106 cells were resuspended in 25 mL.
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