Human cardiac fibroblasts were transfected with 20 nM of either Orai1 siRNA (#s39560, Thermo Fisher Scientific, Loughborough, UK) or negative control siRNA (#4390843, Thermo Fisher Scientific, Loughborough, UK) using Lipofectamine RNAiMax Transfection Reagent (#13778150, Thermo Fisher Scientific, Loughborough, UK) for 48 h. The protein knockdown efficacy of Orai1 was assessed 48 h after siRNA transfection.
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