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Figure 2


Fig. 2. Percentage of larvae swimming in response to 10–7 mol l–1 tetrodotoxin (TTX) or tapwater (control). Inert silicon gel was applied either to the forehead (control) or to the external nares of larvae to block nasal cavities. Asterisk denotes a significant difference between larval responses to TTX and tapwater, using a Fisher exact test (P<0.001).