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Circadian oscillation of FSD1 mRNA. Total RNA was isolated from tissue collected between 8 am and midnight from plants grown for 21 d in a 9-h photoperiod (lights were on from 8 am to 5 pm) and subjected to RNA blot hybridization analysis conducted using an FSD1 cDNA probe. The open bar at the top of the figure represents samples harvested during the illuminated period; the dark bar represents darkness. The time is presented on a 24-h time scale.
