Differential expression of circHIPK3, miR‐29b and AKT3 mRNA and cell apoptosis rate in the H9C2 cells transfected with NC siRNA, circHIPK3 siRNA, circHIPK3 siRNA+pcDNA, circHIPK3 siRNA+pcDNA_AKT3 (*P value < .05 vs NC siRNA; **P value < .05 vs circHIPK3 siRNA+pcDNA) A, Differential expression of circHIPK3 in the H9C2 cells transfected with NC siRNA, circHIPK3 siRNA, circHIPK3 siRNA+pcDNA, circHIPK3 siRNA+pcDNA_AKT3. B, Differential expression of miR‐29b in the H9C2 cells transfected with NC siRNA, circHIPK3 siRNA, circHIPK3 siRNA+pcDNA, circHIPK3 siRNA+pcDNA_AKT3. C, Differential expression of AKT3 mRNA in the H9C2 cells transfected with NC siRNA, circHIPK3 siRNA, circHIPK3 siRNA+pcDNA, circHIPK3 siRNA+pcDNA_AKT3. D, Differential apoptosis rate of the H9C2 cells transfected with NC siRNA, circHIPK3 siRNA, circHIPK3 siRNA+pcDNA, circHIPK3 siRNA+pcDNA_AKT3