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The effects of the rhesus serotonin transporter linked polymorphic region (rh-5-HTTLPR) polymorphism and sex on vocalization (frequency in a 300-s session) on during the acute (Ac) and chronic phase (Chr) of four repeated separation stress. During the acute phase, levels for S1 were higher than S2 and S3; during the chronic phase, levels for S1 were higher than S3 and S4 (p < .05). Bars depict mean ± standard error of the mean, and all post hoc tests were performed using Tukey–Kramer.
