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Expression of HCN4 and Cav3 in undifferentiated human embryonic stem cell (hESC). (A) Undifferentiated hESC expressing HCN4 (green), but not Cav3. (B) 3D reconstruction of a stack of confocal images showing HCN4 expression (red) in a single undifferentiated hES cell, showing clearly the cell surface (sarcolemmal) localization of the ion channel. Scale bar=10 μm. Color images available online at www.liebertpub.com/scd
