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Fig. 1. (A) Propagating action potential recorded from a white muscle fibre of musculus tubulatus using a microelectrode. The dotted line indicates 0 mV. External solution, artificial seawater (ASW). (B) Force generated by a bundle of seven white muscle fibres in response to electrical stimulation measured with a strain gauge. Ten traces were averaged. Arrows indicate when stimulation was applied with a suction electrode. (Bi) Recorded in ASW, (Bii) recorded 10 min after the external ASW was switched to 0Ca2+-ASW containing 10 mmol l-1 Co2+.





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