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Fig. 6. The effect of 1 µmol l-1 RU-486 on the diurnal cycle of
Jurea in R. marmoratus (Series VII). For each 6 h
time interval following the initial exposure to RU-486 (12:00-18:00 h), fresh
1 µmol l-1 solutions were added to the chamber. White and black
bars above the graph indicate periods of light and dark, respectively. Values
are expressed as means + s.e.m. (N=8). Treatment values (white bars)
labeled with an asterisk are significantly different from control values
(black bars) at corresponding time intervals (P<0.05).