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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.