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(A) Shear modulus as a function of collagen concentration for gels without cells. Error bars: standard deviation. CRM images for gels without cells for (B) 2 mg/ml; (C) 3 mg/ml; and (D) 4 mg/ml. (E) CFM and CRM overlay of DU-145 cells (green) in 3 mg/ml collagen (white) 5 days after seeding. Scale bar for CRM images: 30 µm.
