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(A) levels of arginine vasotocin (AVT) and (B) levels of isotocin (IT) in four treatment groups: a) sympatric cleaner (Labroides dimidiatus), b) allopatric cleaner (Elacatinus evelynae), c) conspecific (N. elegans) and d) ball, expressed as AVT (pmol/mg) and IT (pmol/mg). Medians (full lines) and interquartile range are presented in boxes.
