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Entrainment to the LD cycle is preserved under simulated food shortage conditions. Diurnal working for food mice (A) and nocturnal ad libitum fed controls (B) reentrain transiently to shifts of the LD cycle. (C) The percentage of daytime activity of both groups (mean ± SEM) is shown for the full duration of the experiment with a 8-h delay on day 21 and a 8-h advance of the LD cycle on day 38. WL is workload in the WFF protocol.
