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Western blot analysis of human A549 (lanes 1 & 2) and human MDA-MB-231 (lanes 3 & 4) whole cell lysates under native (lanes 1 & 3) and denatured (lanes 2 & 4) conditions. The blots were probed with mouse monoclonal anti-CD44 (CM0071) at 1:1000 (lanes 1-4).