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Fig. 3. Actogram of migration for planula larva in (A) normal seawater, (B) seawater containing 10-8 mol l-1 He-LWamide II, or (C) seawater containing 10-7 mol l-1 Hydra-RFamide I. The time of observation is plotted against step length (distance moved between two frames: 30 s).