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Size and distribution of pores in protein hydrogels treated with a salt-leaching procedure. (A) Size distribution of pores within the protein hydrogels matrix. The used NaCl crystals were grinded with a pestle and mortar for a specific times: (B) 10 min. (C) 2 min. (D) 1 min. (E) not grinded. Protein hydrogels were stained with rhodamine B and investigated via confocal laser scanning microscopy. Scale bar 50 μm.
