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Extracellular matrix and integrin expression in beating areas from hESCs. a–e hESC-CM from hES3-GFP are surrounded by collagen I, collagen IV, collagen XVIII, laminin and fibronectin (GFP not shown for clarity). f–m hESC-CM express collagen receptor integrin α11, some laminin receptors α3 and α6, fibronectin/vitronectin receptors integrin α5 and αV, and the common β-subunit integrin β1. TnI and α-act cardiomyocyte markers troponin I or α-actinin, green GFP, blue DAPI. Scale bars 20 μm
