Figure 3
![Figure 3](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2F1477-3155-4-4/MediaObjects/12951_2005_Article_31_Fig3_HTML.jpg)
Histology Section of the RWM Model with SPION. Histology of the RWM cell culture model. The section shows the outer and inner MDCK epithelial layers. In between the 2 MDCK layers are human fibroblasts. The image also shows clusters of SPION being pulled through with a magnetic field.