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Collagen I–induced changes in NMuMG/E10 cells. NMuMG/E10 cells were cultured on noncoated (a and d), collagen I-coated (b and e), or fibronectin-coated (c and f) coverslips. a–c, phalloidin staining. d–f, paxillin staining. Photographs were taken using a 40× oil objective.