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Monitoring unit of the bioreactor: Glass plate (1); cylinder (2); fixing screw (3); luer-lock with attached three-way stopcock (4). The monitoring unit grants a stable and secure way to observe the PUHV without risk of contamination. A seal ring on top of the glass plate ensures a sealed off environment inside the bioreactor while providing a clear view on the valve leaflets. The endoscope can be secured with the fixing screw. Scale bar = 50 mm.
