Fig 3. Examples of Prussian blue–stained histopathology of mouse Sca1+ hematopoietic stem cells labeled with ferumoxides/poly-L-lysine (A), human CD 34 AC 133 hematopoietic stem cells labeled with ferumoxides/protamine sulfate (B), and human mesenchymal stem cells labeled with ferumoxides/protamine sulfate (C). Both mouse and human hematopoietic stem cells have been used as endothelial precursor cells (Bar = 20 µm).