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Variation in contractility of vimentin-null cells with cell density and gel composition. Normal or vimentin-null mouse embryonic fibroblasts (mEFs) were cultured in 2 mg/mL collagen gels for 7 days at densities of 50 (A) or 700 (D) cells/μL. Gels were freed from the dish edge 24 h after plating.
