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Fig. 5. INa under action potential clamp. Representative atrial
and ventricular action potentials (top) were used to elicit
tetrodotoxin-sensitive INa (middle) at physiological
external Na+ concentration (154 mmol l-1). The bottom
panel shows Vmax mean (± s.e.m.; N=12)
calculated from INa, Vmax measured in
the intact tissue and their difference. Asterisks show a significant
difference (P<0.05) between atrial and ventricular myocytes.