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Common marmoset fathers show decreased circulating androgen and increased estrogen production 30 minutes following smelling their own infant scent compared to a novel infant’s scent of the same age. The scent was collected from infants 5–10 days of age and presented to the males in an isolated room. The x-axis indicates the vehicle, own, or novel treatment the males received during the scent presentation. Data from Ziegler et al. 2011, Hormones and Behavior 59, 265–270.
