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AFM imaging of 2 mg/ml collagen gels with and without RJ EVs; 3D height (5 × 5 μm) and amplitude (2 × 2 μm; scale bar = 400 nm) images of control collagen and collagen loaded with (2.5 × 109/ml) RJ EVs, imaged in AC mode; Arrows indicate RJ EVs released from the collagen gel.
