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SEM images of silk fiber surfaces. (a) Non-degummed raw silk fibers, (b–j) degummed with 0.01, 0.05, 0.1, 0.3, 0.5, 1.0, 3.0, 4.0, and 6.0 g/L papain, (k) degummed with 0.5 g/L Na2CO3, (h’) magnified image of (h). Scale bars: (a–k) 20 μm, (h’) 10 μm.
