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Figure 4 Incorporation of ¹⁴C-phenylalanine (Phe) and protein mass (protein/DNA ratio) of cardiomyocytes cultured for 24 h in presence of phenylephrine (PE, 10 µmol/liter), norepinephrine (NOR, 1 µmol/liter), or NOR and atenolol (ATE, 1 µmol/liter). Data are expressed as percentages relative to the control values. Data are means ± SEM from n = 6 cultures. * = p < 0.05 vs. control; ^# = p < 0.05 vs. NOR. Open bars = PE; filled bars = NOR; hatched bars = ATE + NOR.