Fig. 4.

KCNE2 transcription related to ventricular level at P120. a At embryonic stage E9.5 dpc, KCNE2 is undetectable in atrium and ventricle. KCNE2 transcription, first detected at E13.5 dpc, rises in the atrium to attain maximum level at P2 but remains low in the ventricle. After P2, atrial KCNE2 declines rapidly to adult levels in atrium and ventricle. Statistical analysis: *P < 0.05, atrium versus ventricle compared. b At P10, the majority of KCNE2 appears in the sinoatrial node (SAN), levels are significantly higher than in the whole atrium, intermediate amounts in the left atrial auricle (LAA), and low levels in the right (RV) and left ventricle (LV) and the interventricular septum (Se). Statistical analysis: *P < 0.05, SAN and LAA, respectively, are compared pairwise to whole atrium at P10. #P < 0.05, LV, RV and Se, respectively, are compared pairwise to whole ventricle at P10 (n = 3)