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Contractile protein expression in fused hMSC tubes. Tubes were fabricated from 3-day-old hMSC rings, which were allowed to fuse for 7 days in static conditions. Green = SMA (A), SM22-α (B), or calponin (C), blue = nuclei. Lumen on bottom of image. Scale = 100 μm. hMSC, human mesenchymal stem cell. Color images available online at www.liebertpub.com/tea
