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Fig. 1. Effect of histidine (His) on the flagellar motility activation of Asterina pectinifera sperm. Sperm were suspended in (A) ASW containing 0–10 mmol l–1 histidine or (B) Na-free ASW containing 0–40 mmol l–1 histidine, and the percentage of motile sperm was calculated. Values are means ± S.D.; N=3.