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Fig. 4. Effects of RU486 treatment on locomotor activity (hops min-1) in
spring migrants and in wintering birds. Locomotor activity was determined with
motion detectors in registration cages and was investigated during three
periods of the day: early-day, late-day and night. In response to treatment,
locomotor activity changed similarly in controls and in RU486-treated birds
during all examined periods. Locomotor activity is shown before and after
RU486 injections. Sample size is indicated. Error bars represent
S.E.M.