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Construction of the circulation system. (A) Overview of a bioreactor assembly and the circulation system. *: Bubble trap, **: catheter connector. (B) Schematic illusration of a cross-section of the tubular tissue. Millar catheter was inserted into the tubular tissue. *: Swollen tubular tissue. (C) The photograph shows a tube holding chamber and a microelectrode (*). Bar = 10 mm.
