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Visualization of cell–cell interactions by 3D cell arrays in mono- and cocultures. Interactions of ASCs and ECFCs in comparison to separated arrays of ASCs and ECFCs cultivated for 10 days under VEGF-free conditions. A circle indicates the printed ECFC spot and a cross indicates the printed ASC spot. Scale bars=800 μm. VEGF, vascular endothelial growth factor.
