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Fig. 1. Preparation for recording the force produced by the tergal depressor of trochanter (TDT) muscle. A glass needle was bonded to a strain gauge using shellac. Each fly was mounted on a tungsten needle mounted on a micromanipulator. Its tibia was set in line with the glass needle to which it was glued. Electrical stimuli were delivered to the giant fibre system by two tungsten needle electrodes in the neck or head. The contraction of the TDT causes the fused trochanter–coxa to press downwards against the strain gauge.





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