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Tbx18 + epicardial cells contribute to smooth muscle cells of 2nd CVP. (A, B) Immunostatining for RFP, PECAM and SMA on Tbx18-Cre; Rosa26-RFP heart sections shows Tbx18 + epicardial cells contribute to smooth muscle cells but not endothelial cells of 2nd CVP (arrowheads). Arrows indicate the magnified images of boxed regions. Scale bars, 100 µm.
