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Figure 5


Fig. 5. Percentage of newts swimming upstream to the site of arginine analog or control (stream water) solution release. Each compound was tested at 10–5 mol l–1, with separate experiments performed for (A) carboxyl substitutions, (B) amine substitutions, (C) carbon chain substitutions, and (D) guanidinium substitutions. Arg, arginine; Guan, guanidine; AGB, agmatine; AME, arginine methyl ester; GAA, guanidinacetate; GBA, guanidinobutyrate; HA, homoarginine; AGPA, {alpha}-amino-ß-guanidinopropionate; Lys, lysine; NA, N-{omega}-nitro-L-arginine; NV, norvaline. Asterisks denotes a significant difference between larval responses to test and control (stream water) solutions, using a Fisher exact test (P<0.05).





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