Endothelial progenitor cell (EPC)-seeded stents attached to a balloon catheter (A, B). Fluorescence images of an EPC-seeded stent (C, D) observed by nuclear staining of EPCs with Picogreen™ dye. Original magnification: ×40 (C), ×20 (D). Bar = 1 mm. Reprinted with permission from ref. 214 (as published in T. Shirota et al., “Fabrication of endothelial progenitor cell (EPC)-seeded intravascular stent devices and in vitro endothelialization on hybrid vascular tissue” in Biomaterials, 24, 2295–2302, Copyright: Elsevier 2003).