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Figure 1 Incorporation of 3H-phenylalanine (Phe) of cardiomyocytes cultured for 20 h in the presence of norepinephrine (NOR) at concentrations indicated (open bars) and (A) in the presence of prazosin (0.1 µmol/liter; filled bars) or (B) propranolol (1 µmol/liter; filled bars). Data are expressed as percentages relative to the control values. Data are means ± SEM from n = 8 cultures. * = p < 0.05 vs. each other; ** = p < 0.01 vs. each other; n.d. = not determined.