hiPSCs (19‐9‐7 T,WiCell, Madison, Wisconsin) were transduced with the puromycin gene under the α‐myosin heavy chain (MHC) promoter to enable enrichment of cardiomyocytes postdifferentiation and a double fusion construct of reporter genes; firefly luciferase (Fluc) for BLI and enhanced green fluorescent protein (GFP) to enable in vivo tracking of cell engraftment longitudinally.36 hiPSCs were plated and differentiated for 30 days using a directed differentiation protocol.37 hiPSC‐CMs enriched with puromycin and treated with tumor necrosis factor‐α (TNF‐α; 20 ng/mL for 20 minutes) or angiotensin II (ANG II, Sigma‐Aldrich; 1 μM for 24 hours) with or without TPPU (1 μM) were fixed and stained with antimyosin light chain‐2a (MLC2a), anti‐myosin light chain‐2v (MLC2v), and anti‐pERK1/2 antibodies (Cell Signaling Technology, Danvers, Massachusetts) before flow cytometric analyses as described above.
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