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Schematic diagram of the tether system. After the arterial line has been placed in the mouse the line is inserted into the catheter harness (1), threaded up the spring casing (2) for the catheter, and then attached to the swivel device (3) on the swivel arm (4). The catheter tubing (5) exits from the spring casing and is attached to the pressure transducer (6) set at the level of the heart.
