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Fig. 4. Effects of 0Ca2+-ASW containing 10 mmol l-1 Co2+ and of 0Na+-ASW on twitches of a single caudal heart muscle fibre electrically stimulated every 2 s with a microelectrode inserted into the fibre. Twitches were detected with a CdS photocell from a video monitor screen. ASW, artificial seawater.