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Scanning electron micrograph of 1 mg/L human fibrinogen polymerized by 1 U/mL thrombin at pH 7.4 and 150 mM NaCl. Full width of the figure is 62.5 mm. Janmey PA, Winer JP, Weisel JW. Fibrin gels and their clinical and bioengineering applications. J R Soc Interface. 2009;6(30):1–10, by permission of The Royal Society.15
