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Western blot image of native human cell lysates: A549 (lanes 1 & 5), MeWo (lanes 2 & 6), and MDA-MB-231 (lanes 3 & 7), as well as human plasma fibronectin (lanes 4 & 8). The blot was probed with mouse monoclonal antibodies anti-fibronectin FM0141 (lanes 1-4) or anti-fibronectin FM0131 (lanes 5-8) at 1:1000.