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Conduction velocity in right atrial muscle of animals from 1 day to 38 months of age. Endocardial action potential conduction velocity was measured perpendicular to the crista terminalis (CT) as denoted by the dotted arrow in panel A. The conduction velocity was increased at 1 month compared with the neonate but conduction declined over the remaining ages until 38 months (B) (n = 5 per age group; ANOVA p < 0.01; linear regression, y = −0.0018x + 0.38).
