Fig. 4From: Acceleration of bone union by in situ-formed hydrogel containing bone morphogenetic protein-2 in a mouse refractory fracture modelVon Kossa staining of undecalcified fresh-frozen sections of femur and surrounding muscle. Von Kossa staining of a, b control; c, d IFH-HA/PBS; and e, f IFH-HA/BMP-2. g Quantification of new bone at fracture sites. *p < 0.05. Scale bars indicate 500 μm. *p < 0.05Back to article page