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Actogram showing a clear nocturnal pattern of crawling by a Melibe specimen exposed to a natural LD cycle, followed by DD (tau = 22.9 h). Black bars indicate periods of darkness in LD. Note that there was a period of inactivity around the transition from LD to DD. However, this inactivity began before the shift to DD, and other animals did not exhibit such periods of inactivity around this transition, suggesting that this period of quiescence was not related to the transition to DD.
