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Fig. 2. Migration tracks of planula larvae 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 three tracks shown were obtained from independent experiments, but are shown together to aid comparison. The rectangular box surrounding the tracks represents the spectrophotometer cell with 30 mm light path and 10 mm width that was used as a container to observe planula migration.