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SEM images of collagens from grass carp skin, grass carp scales, and crucian carp skin. (a), (c) and (e) show the SEM images of the GCC, GSC, and CCC collagen after self-assembled for 10 h in a 30 °C salt solution. (b), (d) and (f) show the SEM images of the GCC, GSC, and CCC collagen after drying at room temperature. The red circles indicate the periodic ring D band of collagen.
