passages.id: split_6_test_1092_passage
passages.type: progene_text
passages.text: En face confocal microscopy of arterial segments revealed that soluble fibronectin had polymerized on the alpha5beta1 integrin - expressing SMCs of the luminal surface of the injured arterial neointima , but not on the alpha5beta1 integrin - negative neointimal SMCs below this or on the endothelial cells of uninjured arteries .