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A-D Representative CD31 staining in the skin after different weeks from biomaterial insertion. (A) PEG-EMD at 1 week, (B) PEG-EMD at 2 weeks, (C) PEG-NBG at 4 weeks, and (D) PEG-NBG at 8 weeks. The arrows indicate positive small-caliber vessels. (E) Microvascular density evaluated at each time point in several groups. ***p<0.0001 versus empty and other PEG preparations, **p<0.05 versus empty pouch. Color images available online at www.liebertpub.com/tea
