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Apelin (10 nM) effects on contractile parameters of freely contracting cardiomyocytes, isolated from control, N = 18, n > 40 for each condition and for each N (A) and APJ-KO (B) mice (N = 5 each for control and APJ-KO; n = 69 for apelin-free and n = 53 for apelin-exposed condition). Unpaired experiments.
