Fig. 5
![Fig. 5](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs40824-018-0121-2/MediaObjects/40824_2018_121_Fig5_HTML.gif)
Histological analysis of subcutaneously implanted collagen spheroids at 4 weeks. a Safranin-O staining and b von Kossa staining. The boxed area appears in higher magnification. Scale bar is 500 and 200 μm, respectively
Histological analysis of subcutaneously implanted collagen spheroids at 4 weeks. a Safranin-O staining and b von Kossa staining. The boxed area appears in higher magnification. Scale bar is 500 and 200 μm, respectively