Fig. 9From: Donut-like MOFs of copper/nicotinic acid and composite hydrogels with superior bioactivity for rh-bFGF delivering and skin wound healingMasson’s trichrome staining and Weigert’s elastic staining (a) Masson’s trichrome staining was performed on day 3, 7, and 14. b Weigert’s elastic staining on day 7 and 14. (elastic fibers, black arrow)Back to article page