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bPEI‐AuNPs enhance calcium handling of hiPSC‐derived cardiomyocytes within hydrogels. a,b) Local calcium minima and maximum concentration based on Fluo‐4 calcium analysis. Analyzed regions of interest (ROI) are indicated by black circles (a). Representative examples of intracellular calcium changes of cardiomyocytes in 3D engineered tissues for different ROIs are provided individually (a) and as overlays (b) to indicate synchronous calcium peaks. Scale bars: blue: 200 µm.
