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Image of the fiber stretching apparatus attached to the microscope stage. The glass micropipettes were held in XYZ stages attached to the microscope stage by an adaptor plate. The Fn fiber is attached between the stationary sensor pipette and the actuated stretch pipette and immersed in buffer solution in an open sided sample chamber. The position of the stretch pipette is controlled by a proportional feedback loop to maintain a constant force on the Fn fiber.
