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ICA cells within the SA node in the mouse heart at E13.5. The SA nodal region in the mouse heart contains TH-positive cells (A); HCN4 expression demarcates the SA node region (B); wherein some cells co-express TH (C); Tropomyosin (TroM) is used as a general cardiomyocyte marker (D). Magn. 63×. RCV = right cardinal vein.
