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Fig. 2. Percentage of larvae swimming in response to 107 mol
l1 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).