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. 2017 Jan 19;12(1):e0169731. doi: 10.1371/journal.pone.0169731

Fig 3. SEM images of cross-linked and uncross-linked lyophilized collagen sponges of different concentration.

Fig 3

A, B: cross-section and surface of 3.3 mg/ml collagen sponges cross-linked by 100mM EDC for 24 h, respectively. C, D: cross-section and surface of 10.0 mg/ml collagen sponges cross-linked by 100mM EDC for 24 h, respectively. E, F: cross-section and surface of 10.0 mg/ml collagen sponges uncross-linked, respectively.