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Fig. 1. Diagram of experimental arrangement. The byssal end of the preparation was
hooked to the lower lever of the displacement transducer with a stainless
steal wire connector, while the shell end was held with the extension of the
force transducer. The lever was initially fixed in position by stops 1 and 2,
and after the full development of ACh-induced isometric force, stop 2 was
removed to load the preparation with the spring, hooked between the upper
lever and the micromanipulator.