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Fig. 5. Chirps produced by a male Apteronotus leptorhynchus before and after injection of arginine vasotocin (AVT). (A) Responses to -12Hz difference frequency (DF) stimulation after a control injection of saline but before AVT injection. (B) Responses of the same animal to -12Hz DF stimulation following AVT injection. The calibration is the same for A and B. Temperature 27°C.