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Frequency of open mouth displays (A), number of mounts (B) and the frequency of genital sniffing (C) at the morning (□) and at the afternoon (●) observations in marmosets observed for 21 days following pairing. Data are mean ± SEM of number of occurrences per 20 min from Day 1 and from the following 5-day periods. +, different from the morning of Day 1, p < 0.05. *, different from the afternoon of Day 1, p < 0.05.
