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SEM micrographs of ES cell culture under static and flow perfusion conditions. After 10 d of culture, scaffold surfaces for the different experimental groups (S, static; B-04, 0.04 mL/min; B-08, 0.08 mL/min; and B-40, 0.40 mL/min) were examined by SEM. (Scale bar, 50 μm.)
