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Figure 4 (A) Examples of the four types of action potential (AP) in the control state. (B) Distribution of the four types of AP recorded in the control, aorto-pulmonary artery shunt (APS), and aorto-pulmonary artery shunt reversion (APSR) states (numbers of animals: 7, 7, and 3, respectively; p < 0.001). (C) Correlation analysis of percent D-type cells as a function of atrial area index. Solid line = regression line; dashed line = 95% confidence interval.