*2.9. Statistical Analysis*

The statistical significance of the differences in circular variance, sarcomere length, and height to width ratio of the hiPSC-CMs was assessed by Mann–Whitney U test where *p* < 0.05 was considered statistically significant. Assessing the statistical significance of differences in gene expression levels was performed using the Kruskal–Wallis test with Bonferroni correction. When comparing the calcium baseline measurements to adrenaline measurements, related samples' Wilcoxon Signed Rank Test was used. *p* < 0.05 was considered statistically significant. The data are presented as mean ± standard deviation.
